a triprotic acid h3a has pka's of 2.50, 5.75, and 9.25. what is the pkb for the base a3-? if you need to, assume the solution is at 25 oc, where the kw is 1.00x10-14.

In the reaction: Zn + H2SO4→ZnSO4+ H2, the mole ratio of zinc to sulfuric acid is 1:1.

A mole ratio is the ratio of the amounts in moles of any two compounds or elements involved in a chemical reaction. It is the ratio of the number of moles of one substance to the number of moles of another substance in a balanced chemical equation.

Mole ratios are essential in stoichiometry, which is the study of the quantitative relationships between reactants and products in chemical reactions. They are used to calculate the amounts of products that can be obtained from a given amount of reactants, or the amounts of reactants needed to produce a desired amount of products.

The balanced chemical equation for the reaction between zinc (Zn) and sulfuric acid (H2SO4) is:

Zn + H2SO4 → ZnSO4 + H2

From the equation, we can see that the mole ratio of zinc to sulfuric acid is 1:1. This means that for every one mole of zinc that reacts, one mole of sulfuric acid is required.

Therefore, the mole ratio of zinc to sulfuric acid is 1:1.

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Answer:

covalent compounds

CsF

Nao

CHN

PCI

CAO

NH

WO

lonic compounds

CS

CdBr

N

SOS

Electrons are found in orbits around the nucleus. This was an assumption Bohr made in his model.

Compared to the valence shell model, the Bohr's model of the hydrogen atom is quite simple. It may be seen as an outmoded scientific theory since it may be derived from the more comprehensive and precise quantum mechanics as a first-order approximation of the hydrogen atom.To expose students to quantum mechanics or energy level diagrams before moving on to the more accurate but more challenging valence shell atom, the Bohr model is still often used in classroom instruction.This is due of its simplicity and its right conclusions for a few systems.

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The Baeyer permanganate test and chromic acid tests work by converting an aldehyde to a carboxylic acid functional group.

KMnO₄ and H₂CrO₄ act as oxidizing agents. A ketone does not react with these reagents because it does not have a hydrogen atom attached to the carbonyl group.

The Baeyer permanganate test is used to identify the presence of unsaturation (i.e. double bonds) in a compound. When a double bond is present in the compound, it will be oxidized by potassium permanganate (KMnO₄) to form a diol functional group. In the case of aldehydes, the double bond is present between the carbonyl carbon and the hydrogen atom.

Therefore, the reaction will convert an aldehyde to a carboxylic acid functional group. This reaction is also known as the oxidation of aldehydes with KMnO₄.

The chromic acid test is another method for identifying the presence of unsaturation in a compound. It uses chromic acid (H₂CrO₄) as the oxidizing agent. Like the Baeyer permanganate test, the chromic acid test will convert an aldehyde to a carboxylic acid functional group. It is important to note that the chromic acid test is more sensitive to the presence of double bonds than the Baeyer permanganate test.

Therefore, it is often used as a confirmatory test after a positive result is obtained from the Baeyer permanganate test.

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The length of the hallway is 20 feet. To calculate the length of the hallway in feet, we need to first convert the measurements to the same unit of measurement. Let's convert the second part from yards to inches, since the first part is already in inches:

3 yards = 3 x 36 inches = 108 inches

Now we can add the two lengths together:

Total length = 132 inches + 108 inches = 240 inches

Finally, we can convert the total length from inches to feet by dividing by 12:

Total length = 240 inches ÷ 12 = 20 feet

Therefore, the length of the hallway is 20 feet.

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Full Question ;

The girl was measuring the hallway the first part was 132 inches long the second part was 3 yards long how long is the Hallway in feet??

by use identical respirometers. An intermediary in this process is pyruvate.

Pyruvate is a crucial intermediary in several metabolic processes, including gluconeogenesis, fermentation, cellular respiration, fatty acid production, etc. Pyruvate is created near the conclusion of the glycolysis process. Through Kreb's cycle, pyruvate gives energy to living cells.

Pyruvate is a crucial intermediate that can be employed in a number of anabolic and catabolic pathways, including as oxidative metabolism, glucose re-synthesis (gluconeogenesis), cholesterol synthesis (de novo lipogenesis), and maintenance of the tricarboxylic acid (TCA) cycle flow.

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The molar mass of Freon-11 gas if its density is 6.13 g/L at STP is 137 g/mol. The density of a gas depends on the gas's temperature, pressure, and molar mass.

This implies that the molar mass of a gas can be determined using its density, temperature, and pressure.

To compute molar mass, we'll use the ideal gas law, which is:

PVM = nRT

where: P is pressure, V is volume, M is molar mass, n is the number of moles, R is the universal gas constant, T is temperature

Rearranging the ideal gas equation to solve for molar mass M, we have:

M = (mRT) / (PV)

where: M is the molar mass of the gas (in grams per mole)m is the mass of gas in grams, R is the universal gas constant (0.08206 L atm / mol K), T is the temperature of the gas in Kelvin (K), P is the pressure of the gas in atmospheres (atm), V is the volume of gas in liters (L)

Here, we have the density of the gas which is given as 6.13 g/L at STP.

We can calculate the molar mass of the gas using the following formula:

M = dRT / PM

= 6.13 g/L * 0.08206 L atm / mol K * 273.15 K / 1 atm / 137 g/mol

M = 136.96 g/mol≈ 137 g/mol

Therefore, the molar mass of Freon-11 gas if its density is 6.13 g/L at STP is 137 g/mol.

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Answer:

jdkdidieidiriidiriri

Taking into account the reaction stoichiometry, 22.29 grams of Al₂(SO₄)₃ are formed if 3.52 grams of aluminum completely reacted with H₂SO₄.

The balanced reaction is:

2 Al + 3 H₂SO₄ → Al₂(SO₄)₃ + 3 H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 54 grams of Al form 342 grams of Al₂(SO₄)₃, 3.52 grams of Al form how much mass of Al₂(SO₄)₃?

mass of Al₂(SO₄)₃= (3.52 grams of Al× 342 grams of Al₂(SO₄)₃)÷ 54 grams of Al

mass of Al₂(SO₄)₃= 22.29 grams

Finally, 22.29 grams of Al₂(SO₄)₃ are formed.

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It is important not to dilute the initial sample before loading it onto the chromatography column because this can negatively impact the separation and resolution of the components in the sample.

Dilution can lead to a decrease in the concentration of the components in the sample, which can result in poor separation and overlap of the peaks. Additionally, dilution can cause loss of the target compound or impurities in the sample due to adsorption onto the walls of the container used for dilution.

By keeping the sample concentrated and loading it directly onto the chromatography column, the chances of obtaining a clear separation and good resolution of the components in the sample are increased

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When a salt such as PbCl2 is added to water, it dissolves because of the attraction between the positively charged Pb2+ ions and the negatively charged Cl− ions and the polar nature of water molecules.

Water molecules' oxygen atoms have a partially negative charge, while their hydrogen atoms have a partially positive charge.

When a solid salt like PbCl2 dissolves in water, water molecules surround each ion and dissolve it by breaking apart the ionic bond that holds the ions together.

When a solid dissolves in water, the concentration of ions in the solution increases. When PbCl2 dissolves in water, it creates one Pb2+ ion and two Cl- ions.

Adding water to PbCl2 increases the concentration of ions.The solubility of PbCl2 in water is directly proportional to the amount of chloride ions present.

In the presence of water, the equilibrium in the following reaction shifts to the right: PbCl2(s) → Pb2+(aq) + 2Cl−(aq)

This results in an increase in the number of ions in the solution and a corresponding decrease in the solubility of the salt, indicating that the chloride ion concentration increases as more water is added.

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The statement "the atomic electron configuration influences the resulting mechanical properties of the material" is TRUE. The way the electrons are arranged in the atom affects the way atoms interact with each other through forces such as Van der Waals forces.

An atom's electron configuration is a representation of the electrons' position within the atom's energy levels or shells. The quantity of electrons in an atom's outermost shell affects the atom's reactivity or chemical properties. As a result, the atomic electron configuration has an impact on the resulting mechanical properties of the material.

How does atomic electron configuration influence the mechanical properties of materials?

The atomic electron configuration influences the mechanical properties of materials in the following ways:

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The volume of hexane that contains 5.33 x 10²² molecules of hexane is approximately 11.68 mL.

To calculate the number of moles of hexane in 5.33 x 10²² molecules, use the formula,

Number of moles = Number of molecules / Avogadro's number

= 5.33 x 10²² / 6.022 x 10²³

= 0.0887 moles

Next, we can use the density and molar mass of hexane to calculate the volume of hexane:

Mass of hexane = Number of moles x Molar mass

= 0.0887 moles x 86.17 g/mol

= 7.655 g

The volume of hexane = Mass of hexane / Density

= 7.655 g / 0.6548 g/mL

= 11.68 mL

Therefore, the volume of hexane that contains 5.33 x 10²² molecules of hexane is approximately 11.68 mL.

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The term for the shorthand description of the arrangement of electrons by sublevels according to increasing energy is electron configuration.

This means that electrons are arranged in the atom in the order of increasing energy. The order follows the patterns of the periodic table and consists of the following components:

These components are usually written in shorthand notation, with the principal quantum number first, followed by a letter for the azimuthal quantum number, and then a number for the magnetic quantum number. For example, the shorthand for the electron configuration of hydrogen is 1s1, where 1 is the principal quantum number, s is the azimuthal quantum number, and 1 is the magnetic quantum number.

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There are 567.8 mmHg in 75.7 kpa.

Pressure is the amount of force that is applied over a given area divided by the size of this area.

The units of pressure are as follows:

In SI units, pressure is measured in pascals where;

1 kPa = 760/101.325 = 7.5 mmHg

Hence, 75.7kpa is equal to 567.8 mmHg

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The negative value of the heat of reaction indicates that the combustion of methane is an exothermic reaction, and 890.3 kJ of heat are released per mole of methane burned.

Yes, it is possible to determine the amount of energy released in a combustion reaction. Energy released as the products form is called the heat of reaction or enthalpy change (ΔHrxn) and can be calculated using  balanced chemical equation and the standard enthalpies of formation (ΔHf) of reactants and products.

The standard enthalpy of formation of an element in its standard state is defined as zero.

ΔHrxn = ΣnΔHf(products) - ΣmΔHf(reactants)

ΔHf(products) is the standard enthalpy of formation of each product, n is the stoichiometric coefficient of each product, ΔHf(reactants) is standard enthalpy of formation of each reactant, and m is the stoichiometric coefficient of each reactant.

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

The standard enthalpies of formation of methane, oxygen, carbon dioxide, and water are -74.8 kJ/mol, 0 kJ/mol, -393.5 kJ/mol, and -285.8 kJ/mol, respectively.

ΔHrxn = [ΔHf(CO2) + 2ΔHf(H2O)] - [ΔHf(CH4) + 2ΔHf(O2)]

= [(-393.5 kJ/mol) + 2(-285.8 kJ/mol)] - [(-74.8 kJ/mol) + 2(0 kJ/mol)]

= -890.3 kJ/mol

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During the titration of an unknown acid by a strong base, the initial pH is 4.0. This indicates the acid used is weak acid.

Acid-base titration is a method of analyzing the concentration of a sample of acid or base by calculating the amount of acid or base needed to neutralize it. An acid with a pH of 4.0 can be characterized as a weak acid. The reason for this is that strong acids have a pH that is closer to 0.0 than to 7.0. The difference between the two is due to the fact that strong acids are completely ionized when dissolved in water. Therefore, the initial pH of 4.0 indicates that the unknown acid is weak.

Weak acids only partially ionize when dissolved in water, which means that they have a lower concentration of hydrogen ions (H+) and a higher concentration of undissociated acid molecules in the solution. This implies that a small amount of the strong base will neutralize the weak acid, causing the pH of the solution to rise quickly.

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The most abundant isotope of boron found in nature is 11B. This isotope makes up approximately 80% of all boron atoms, while the other isotope 10B makes up the other 20%.

Boron is a chemical element with the symbol B and atomic number 5. Boron has two naturally occurring isotopes, 10B and 11B. Boron-11 is the most abundant of the two isotopes with an abundance of 80.1%.Boron-10 is a stable isotope of boron that accounts for 19.9% of the Earth's naturally occurring boron. The isotope has an atomic mass of 10.012937u or 10.013u.A neutron makes the difference between the isotopes of boron, which has an atomic number of 5. Boron-10 contains five protons and five neutrons, whereas boron-11 has six neutrons in addition to the five protons.

The mass number of boron-10 is ten since it contains ten particles in total (5 protons + 5 neutrons). "Boron is composed of two naturally occurring isotopes, 10B and 11B.  is the isotope boron-11 (11B) is the most abundant in nature with an abundance of 80.1%.

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Based on the given information about the acid, the acid dissociation constant, Ka of the unknown acid is 4.97 x 10⁻⁷.

To calculate the Ka of the unknown acid, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where:

pH = 4.219 (given)

[A-] = concentration of the conjugate base (NaA)

[HA] = concentration of the acid (HA)

We can find the concentration of NaA and HA using the given information:

moles of HA = 2.43 mol

moles of NaA = 1.75 mol

total moles = 2.43 + 1.75

total moles = 4.18 mol

volume of solution = 1.92 L

[H+] = 10^(-pH)

[H+] = 6.87 x 10^(-5) M

[HA] = (moles of HA) / (volume of solution)

HA = 1.264 M

[NaA] = (moles of NaA) / (volume of solution) = 0.911 M

Using the equation for the dissociation of the acid:

HA + H2O ⇌ H3O+ + A-

Ka = ([H3O+][A-]) / [HA]

We can assume that the concentration of H3O+ is equal to the concentration of NaA, since the pH is closer to the pKa of the acid. Therefore:

Ka = ([NaA][H+]) / [HA]

Ka = [(0.911 M)(6.87 x 10^(-5) M)] / (1.264 M)

Ka = 4.97 x 10^(-7)

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When 57.0 ml of 0.90 m solution of HCI was diluted by water and the ph of this diluted solution is 0.90, the amount of water added to the original solution is: 408.15 mL or 0.408 L.

Given that the original solution is 57.0 mL of 0.90 M HCl, which was diluted with water. The pH of the resulting diluted solution is 0.90. Now, we need to determine the amount of water that was added to the original solution. The pH of a solution is calculated by the formula [tex]pH = -log[H+][/tex].

The concentration of H+ is determined from the molarity of HCl.To calculate the amount of water added to the original solution, we need to use the following equation:

Initial moles of HCl = final moles of HCl

Initial moles of HCl = 57.0 × 0.90 = 51.3

[tex]Final moles of HCl = molarity × volume = 10^(-0.90) moles/L × volume mL/1000 mL/L = 0.1259 × volume/1000 moles[/tex]

[tex]Initial moles of HCl = final moles of HCl51.3 = 0.1259 × volume/1000 mL[/tex]

[tex]Volume of water added = 51.3 × 1000 / 0.1259 mL[/tex]

Volume of water added = 408150 mL

Volume of water added = 408.15 mL = 0.408 L

Therefore, the amount of water added to the original solution is 408.15 mL or 0.408 L.

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The correct option is E. The compound that is not a product of the reaction between 1,3-butadiene and HBr is (Z)-2-bromo-2-butene.

A chemical reaction is a process in which one or more substances (reactants) are transformed into new substances (products) by breaking and forming chemical bonds. Chemical reactions are essential in many natural and synthetic processes, including the formation of the molecules that make up living organisms and the production of materials such as medicines, fuels, and plastics.

Chemical reactions involve the rearrangement of atoms, ions, or molecules, resulting in the formation of new substances with different properties from those of the reactants. The reactants and products of a chemical reaction can be represented by a chemical equation, which shows the identities and quantities of the reactants and products.

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To make a 250 ml solution of 70% ethanol, you will need 175 ml of ethanol and 75 ml of water. The solution will have a final volume of 250 ml with a 70% ethanol concentration.

To make 250 ml of a 70% ethanol solution (in water) from a stock of 100% ethanol, you will need to take the following steps:

Step 1:

Calculate the amount of ethanol required for the solution. The volume of ethanol required to make 250 ml of a 70% ethanol solution can be calculated as follows:

Volume of ethanol = (70/100) x 250 ml= 175 ml

So, you will need 175 ml of 100% ethanol to make a 250 ml solution with a 70% ethanol concentration.

Step 2:

Calculate the volume of water required. To calculate the volume of water needed, subtract the volume of ethanol from the total volume of the solution.

Volume of water = Total volume of solution – Volume of ethanol

= 250 ml – 175 ml= 75 ml

Therefore, you will need 75 ml of water.

Step 3:

Mix the ethanol and water together in the right proportion. Once you have calculated the amount of ethanol and water required, add the 175 ml of ethanol to the 75 ml of water to obtain the 250 ml solution of 70% ethanol in water.

Consequently, the solution will have a final volume of 250 ml with a 70% ethanol concentration.

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The process of sequential migration of electrons from one atom to the next is called electron hopping, while the migration of electrons across a pn semiconductor junction is called diffusion.

The process of sequential migration of electrons from one atom to the next is called electronic conduction, while the migration of electrons across a pn semiconductor junction is called diffusion. Electronic conduction is the movement of charged particles in a medium, typically electrons or holes. The term is commonly used to describe the behavior of electrons in a conductor, which allows them to move freely through the material in response to an electric field. This movement of electrons is what produces the flow of electricity, which is an essential part of our daily lives.

In materials science, diffusion refers to the movement of atoms or molecules from a region of high concentration to a region of low concentration. This process is driven by the random motion of particles, which results in a net flow from areas of high to low concentration. In semiconductors, diffusion is a significant factor in the operation of devices such as diodes and transistors. When a p-type and n-type semiconductor are joined together, there is a gradient in the concentration of electrons between the two regions. This gradient causes electrons to move across the junction by diffusion, which creates a flow of current.

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The ratio of cis-2-methylcyclohexanol to trans-2-methylcyclohexanol can be determined from the 1H NMR spectrum by analyzing the chemical shift and integration of the two peaks present.

In order to determine the ratio of cis- and trans-2-methylcyclohexanols from the 1H NMR spectrum provided, one must interpret the chemical shift and integration of the various peaks present.What is 1H NMR spectroscopy?1H NMR spectroscopy, also known as proton NMR spectroscopy or magnetic resonance spectroscopy, is a technique used to determine the molecular structure of a sample by analyzing its nuclear magnetic resonance (NMR) properties. The chemical shift and integration of a molecule's protons can be used to identify the molecule's structure and determine its ratio of cis- and trans-2-methylcyclohexanols.Here are the steps to determine the ratio of cis- and trans-2-methylcyclohexanols from the 1H NMR spectrum provided:Identify the peaks: In this case, there are two peaks present in the spectrum at 3.05 ppm and 3.75 ppm. These peaks correspond to the protons present in the 2-methylcyclohexanol molecule.3.05 ppm peak: This peak corresponds to the proton present in the trans-2-methylcyclohexanol molecule.3.75 ppm peak: This peak corresponds to the proton present in the cis-2-methylcyclohexanol molecule.Integration: Integration is the measurement of the relative abundance of each type of proton present in the sample. In this case, the ratio of the two peaks can be used to determine the ratio of cis- and trans-2-methylcyclohexanols.Using the integration values of the peaks, the ratio of cis-2-methylcyclohexanol to trans-2-methylcyclohexanol can be calculated. If there are two integrals with a 1:1 ratio, there is an equal amount of cis- and trans-2-methylcyclohexanols present in the sample. If the ratio is 2:1 or 1:2, there are twice as many molecules of one isomer present as the other isomer.Explain in 200 words about how you can determine the ratio of cis- and trans-2-methylcyclohexanols from the 1H NMR spectrum provided1H NMR spectroscopy is a type of nuclear magnetic resonance spectroscopy that can be used to analyze the structure of a molecule. The chemical shift and integration of the protons in a molecule can provide valuable information about its composition and structure.In the case of the 1H NMR spectrum provided, there are two peaks present at 3.05 ppm and 3.75 ppm. These peaks correspond to the protons present in the 2-methylcyclohexanol molecule. The 3.05 ppm peak corresponds to the trans-2-methylcyclohexanol molecule, while the 3.75 ppm peak corresponds to the cis-2-methylcyclohexanol molecule.Integration is the measurement of the relative abundance of each type of proton present in the sample. In this case, the ratio of cis-2-methylcyclohexanol to trans-2-methylcyclohexanol can be calculated using the integration values of the peaks.If there are two integrals with a 1:1 ratio, there is an equal amount of cis- and trans-2-methylcyclohexanols present in the sample. If the ratio is 2:1 or 1:2, there are twice as many molecules of one isomer present as the other isomer. Therefore, the ratio of cis-2-methylcyclohexanol to trans-2-methylcyclohexanol can be determined from the 1H NMR spectrum by analyzing the chemical shift and integration of the two peaks present.

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The true statements about the rate-limiting step in a reaction are it is the slowest step and it limits (or determines) the rate of the reaction. Therefore, option A is correct.

The rate-limiting step is the step in a reaction that has the highest activation energy and therefore proceeds at the slowest rate. It sets the overall rate of the reaction because the other steps in the reaction cannot occur faster than the rate of the rate-limiting step.

However, the rate law of the reaction is determined by the slowest elementary step, which may or may not be the rate-limiting step.

The rate-limiting step is not always the first step in a reaction. It can be any step in the reaction mechanism.

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To determine if a compound will conduct electrical current when dissolved in water, we need to consider its ability to dissociate into ions in solution.

Ionic compounds and strong electrolytes are capable of dissociating into ions, and therefore can conduct electricity in aqueous solution, while non-electrolytes do not dissociate into ions and do not conduct electricity.

Let's take a closer look at the different types of compounds and their behavior in solution:

Ionic compounds: These are compounds composed of ions, which are atoms or molecules that have gained or lost electrons, resulting in a net electrical charge.

When an ionic compound dissolves in water, the ions separate and are surrounded by water molecules through a process called hydration. The resulting solution can conduct electricity because the ions are free to move and carry an electric charge.

Examples of ionic compounds include sodium chloride (NaCl), potassium nitrate (KNO3), and calcium chloride (CaCl2).

Strong electrolytes: These are compounds that are capable of completely dissociating into ions when dissolved in water. Strong electrolytes include soluble ionic compounds, as well as strong acids and bases.

They readily conduct electricity in aqueous solution due to the presence of free ions. Examples of strong electrolytes include hydrochloric acid (HCl), sulfuric acid (H2SO4), and sodium hydroxide (NaOH).

Weak electrolytes: These are compounds that only partially dissociate into ions when dissolved in water. They conduct electricity to a lesser extent compared to strong electrolytes.

Weak electrolytes include weak acids and bases, and their degree of ionization depends on factors such as concentration and pH. Examples of weak electrolytes include acetic acid (CH3COOH) and ammonia (NH3).

Non-electrolytes: These are compounds that do not dissociate into ions when dissolved in water, and therefore do not conduct electricity. Non-electrolytes are typically covalent compounds, which are composed of atoms that share electrons rather than gaining or losing them. Examples of non-electrolytes include sugars, alcohols, and most organic compounds.

To determine if a compound will conduct electricity in aqueous solution, we need to assess its ability to dissociate into ions based on its chemical nature and behavior in water. If you provide specific compounds, I would be happy to evaluate their conductivity for you.

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Explanation :

The empirical formula of a hydrocarbon is C3H8 when 60.68 g are combusted in the presence of oxygen and produce 89.12 g of CO2 and 36.48 g of H2O.

The empirical formula of a compound represents the simplest ratio of atoms present in a compound. We are given that a hydrocarbon is burned and is producing carbon dioxide and water.

Therefore, the following reaction takes place:

CxHy + O2 → CO2 + H2O

We are given the mass of the hydrocarbon and the products produced. We have to calculate the empirical formula of the compound using the following steps:

First,

Secondly,

Thirdly,

Therefore, the empirical formula of the compound is C3H8.

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Answer:

The molar mass of the unknown gas is:

Munknown = (28 g/mol)2 / 0.667 = 83.6 g/mol

The molar mass of the unknown gas can be determined by the Graham's Law of Effusion. According to this law, the rate of effusion of a gas is inversely proportional to the square root of its molar mass.

Thus, if the rate of effusion of the unknown gas is 0.667 times that of Nitrogen (N2), then its molar mass can be calculated as:

Munknown = (MN2)2 / 0.667

Where, MN2 is the molar mass of Nitrogen (28 g/mol).

Therefore, the molar mass of the unknown gas is:

Munknown = (28 g/mol)2 / 0.667 = 83.6 g/mol

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The equilibrium reaction for the formation of cobalt(II) complex when cobalt(II) chloride is dissolved in ethanol and then water is added is given by the following equation:

CoC₂l + 4 ethanol → Co(C₂H₅OH)₄Cl₂

When the cobalt(II) chloride is dissolved in ethanol, a cobalt(II) complex is formed. The complex is a tetrahedral molecule with four ethanol molecules attached to the cobalt ion. When water is added, it causes the equilibrium reaction to shifting to the right, with more of the cobalt(II) complex being formed. This is because the water molecules can displace the ethanol molecules from the complex, allowing the complex to form. The reaction can be expressed as:

CoC₂H₅OH)₄Cl₂ + 4 H₂O ↔ Co(H₂O)₄Cl₂ + 4 C₂H₅OH

In conclusion, the equilibrium reaction for the formation of cobalt(II) complex when cobalt(II) chloride is dissolved in ethanol and then water is added can be given as:

CoCl₂ + 4 ethanol → Co(C₂H₅OH)₄Cl₂ + 4 H₂O ↔ Co(H₂O)₄Cl₂ + 4 C₂H₅OH.

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The following statements about the periodic trend of atomic radius true is i. atomic radius decreases from left to right across a period because zeff increases.

The nuclear charge increases as we move from left to right in the periodic table. Electrons occupy the same shell as the nuclear charge increases, resulting in stronger attraction between the electrons and the nucleus, reducing the atomic radius.The second statement about the periodic trend of atomic radius is incorrect.

Atomic radius actually increases from left to right across a period. This is because the number of electrons in the outermost shell increases as we move from left to right across a period, resulting in greater repulsion between electrons, leading to an increase in the size of the atom. Therefore, option (i) is true and option (ii) is false.

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