kingsley then adds 47.17 ml of naoh to 250.00 ml of the hcooh solution. the neutralization reaction resulted in 0.09 moles of hcooh and 0.026 moles of hcoo- left in solution. determine the ph of the resulting solution.

There are approximately 4.92 x 10^21 nitrogen atoms in 1.20 grams of aspartame.

The two naturally occurring amino acids phenylalanine and aspartic acid, which are also parts of proteins in our bodies and food, are what makeup aspartame. Aspartame's sweet flavor comes from a small modification of the phenylalanine by the addition of a methyl group.

The molecular formula of aspartame is C14H18N2O5.

The molar mass of aspartame,

(14 x 12.01 g/mol) + (18 x 1.01 g/mol) + (2 x 14.01 g/mol) + (5 x 16.00 g/mol) = 294.30 g/mol

Aspartame's molecular weight in 1.20 grams can be computed as follows:

1.20 g / 294.30 g/mol = 0.00408 mol

Every aspartame molecule has two nitrogen atoms.

0.00408 mol x 2 = 0.00816 moles of nitrogen

So, we will use Avogadro's number in order to transform nitrogen moles to nitrogen atoms:

0.00816 mol x 6.022 x 10^23 atoms/mol = 4.92 x 10^21 atoms of nitrogen

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The answer is (a) MgO only, as all of the magnesium and oxygen react completely to form magnesium oxide, and there would be no unreacted magnesium or oxygen left in the reaction vessel.

What is Limiting Reagent?

The limiting reagent can be determined by comparing the mole ratios of the reactants and the coefficients in the balanced chemical equation for the reaction. The reactant that produces the least amount of product based on the stoichiometry of the balanced equation is the limiting reagent.

If 1g of magnesium (Mg) and 1g of oxygen (O2) reacted, they would combine to form magnesium oxide (MgO) according to the following chemical equation:

2Mg + O2 -> 2MgO

The molar mass of magnesium is 24.31 g/mol, while the molar mass of oxygen is 32.00 g/mol. Therefore, 1g of magnesium is equivalent to 0.041 mol, and 1g of oxygen is equivalent to 0.03125 mol.

According to the balanced equation, 2 moles of magnesium react with 1 mole of oxygen to form 2 moles of magnesium oxide. Thus, the limiting reactant in this reaction is oxygen because only 0.03125 mol of oxygen is available, whereas 0.082 mol of magnesium is available.

Using the limiting reactant, we can calculate the theoretical yield of magnesium oxide:

0.03125 mol O2 x (2 mol MgO / 1 mol O2) x (40.31 g MgO / 1 mol MgO) = 2.5 g MgO

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The solubility product (Ksp) can be used to predict whether a precipitate will form when two aqueous solutions are mixed by comparing the ion product (Q) with the Ksp value.

When two solutions are mixed, the ions present in each solution may combine to form a new compound that has a low solubility, resulting in the formation of a precipitate. The solubility product constant (Ksp) is a measure of the maximum amount of a compound that can dissolve in water at equilibrium.

If the ion product (Q) of the solution is less than the Ksp value, then the solution is unsaturated and no precipitate will form. However, if Q is greater than Ksp, then the solution is supersaturated, and a precipitate will form until the concentration of ions in the solution reaches the solubility limit.

In other words, if Q>Ksp, then the solution is supersaturated, and precipitation will occur until Q=Ksp. If Q<Ksp, the solution is unsaturated, and no precipitation will occur. If Q=Ksp, the solution is at saturation and no further precipitation will occur.

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Explanation:

You assign oxidation numbers to the elements in a compound by using the Rules for Oxidation Numbers.

The oxidation number of a free element is always 0.

The oxidation number of a monatomic ion equals the charge of the ion.

The oxidation number of H is +1, but it is -1 in when combined with less electronegative elements.

The oxidation number of O in compounds is usually -2, but it is -1 in peroxides.

The oxidation number of a Group 1 element in a compound is +1.

The oxidation number of a Group 2 element in a compound is +2.

The oxidation number of a Group 17 element in a binary compound is -1.

The sum of the oxidation numbers of all of the atoms in a neutral compound is 0.

The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

__________________________________________________________

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The diffusion term is used to describe why we can smell air freshener across the room shortly after it has been sprayed, hence option C is correct.

When you spray the air freshener, the matter goes from a high concentration region to a low concentration area that is far away from the spraying location. Diffusion is the term used to describe this material movement.

Diffusion is the overall net movement of something from a higher concentration to a lower concentration.

The term "diffusion" is used to explain why we can smell air freshener across the room quickly after it has been applied.

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The pair of aqueous solutions that will result in a precipitation reaction is (i) potassium carbonate and barium hydroxide. When these two solutions are mixed, they will react to form solid barium carbonate and aqueous potassium hydroxide. The balanced chemical equation for this reaction is:

K2CO3(aq) + Ba(OH)2(aq) → BaCO3(s) + 2KOH(aq)

The other two pairs of solutions, (ii) aluminum nitrate and sodium phosphate, and (iii) ammonium bromide and potassium hydroxide, will not result in a precipitation reaction. When these two solutions are mixed, they will form aqueous solutions of the resulting products.

It is important to remember that the solubility rules can be used to predict whether a precipitation reaction will occur when two aqueous solutions are mixed. If one of the products formed in the reaction is insoluble in water, then a solid precipitate will form.

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[tex]\sf \underline{CuCl_2 +\pink{2NaNO_3} \longrightarrow \pink{ Cu(NO3)_2}+2NaCl}[/tex]

According to the equation, 1 mole of [tex]\sf CuCl_2 [/tex] reacts with 2 moles of [tex]\sf NaNO_3[/tex] to produce 1 mole of [tex]\sf Cu(NO_3)_2[/tex] and 2 moles of [tex]\sf NaCl [/tex]

Molar mass of [tex]\sf Cu(NO_3)_2[/tex] -

[tex] \:\:\:\:\:\:\longrightarrow \sf 63.5 + 2\times 14 + 16 \times 6 \\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf 187.5 \\[/tex]

The sodium ion concentration in the solution is 0.238 M, calculated by dividing the total moles of Na+ (0.690 mol) by the solution volume (2.90 L).

To work out the sodium particle fixation in an answer ready by blending 0.345 mol Na2SO4 in enough water to make 2.90 L of arrangement, we can involve stoichiometry and the equation for molarity.

In the first place, we really want to decide the all out number of moles of sodium particles in the arrangement. Every mole of Na2SO4 separates into 2 moles of sodium particles, so we can work out the quantity of moles of sodium particles as follows:

0.345 mol Na2SO4 x (2 mol Na+/1 mol Na2SO4) = 0.690 mol Na+

Then, we can work out the grouping of sodium particles in the arrangement by isolating the quantity of moles of sodium particles by the volume of the arrangement in liters:

0.690 mol Na+/2.90 L = 0.238 M Na+

Accordingly, the sodium particle fixation in the arrangement is 0.238 M. This intends that for each liter of arrangement, there are 0.238 moles of sodium particles present. This estimation can be valuable in different synthetic applications, including deciding the ionic strength of an answer, working out response rates, and planning compound responses.

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The strength of the attraction between water molecules and sodium and chloride ions is stronger compared to the attraction between water molecules themselves. This is due to the ion-dipole interaction between charged ions and polar water molecules.

The strength of the attraction between water molecules and sodium and chloride ions is generally stronger than the attraction between water molecules themselves. This is due to the following reasons:
1. Water molecules are polar, which means they have a partially positive charge on the hydrogen atoms and a partially negative charge on the oxygen atom.
2. Sodium and chloride ions are charged particles, with sodium ions having a positive charge and chloride ions having a negative charge.
3. When water molecules come into contact with sodium and chloride ions, the positive charge on the sodium ions attracts the negatively charged oxygen atoms in water molecules, and the negative charge on the chloride ions attracts the positively charged hydrogen atoms in water molecules.
4. This attraction between charged ions and polar water molecules is called ion-dipole interaction, which is stronger than the hydrogen bonding between water molecules.

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Answer:

When carbon is heated in air, it reacts with oxygen to form carbon dioxide. As the carbon reacts with oxygen to form carbon dioxide, the mass of the carbon decreases while the mass of the oxygen and carbon dioxide increases.

Answer:

When carbon is heated in air, it undergoes a process known as combustion or burning. During this process, carbon reacts with oxygen present in the air, resulting in the production of carbon dioxide gas. This reaction causes the carbon atoms to be lost in the form of carbon dioxide molecules. Hence, the original mass of carbon decreases due to the formation of lighter carbon dioxide molecules that are released into the atmosphere. Overall, the burning of carbon in air results in a reduction in its mass.

They  perform a wide range of functions in the body such as catalyzing reactions, transporting molecules, and providing structural support to cells and tissues.

When answering questions on the platform Brainly, the following guidelines should be followed:- Always be factually accurate, professional, and friendly- Be concise and do not provide extraneous amounts of detail-

Ignore any typos or irrelevant parts of the question- Use the relevant terms in your answer as provided in the student question.The molecule that has a central carbon with an attached hydrogen atom, carboxyl group, and amino group is an amino acid.

Amino acids are the building blocks of proteins. They contain an amino group (-NH2), a carboxyl group (-COOH), and a side chain (-R) attached to the central carbon atom. Some amino acids have additional functional groups such as hydroxyl (-OH), sulfur (-SH), or a ring structure.

Amino acids are the building blocks of proteins. Amino acids can form peptide bonds with other amino acids to form proteins. Proteins are the basic functional and structural units of life.

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The volume of the concentrated 1.5 M solution required to prepare 25 mL of a 7.0 M solution is 0.117 L or 117 mL.

To solve the problem, we use the formula M1V1 = M2V2, which relates the initial concentration and volume of the concentrated solution (M1V1) to the final concentration and volume of the diluted solution (M2V2). In this case, we are given the final concentration (M2 = 7.0 M), the final volume (V2 = 25 mL), and the initial concentration (M1 = 1.5 M), so we can solve for the initial volume (V1) of the concentrated solution that we need to use.

We rearrange the formula to solve for V1, which gives us V1 = (M2 x V2) / M1. We substitute the given values into this equation, and we get V1 = (7.0 M x 0.025 L) / 1.5 M = 0.117 L or 117 mL.

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1-Moist air moves up as it encounters a mountain range: This condition can lead to the formation of clouds because as moist air rises, it cools, and the water vapor in the air condenses into liquid water droplets or ice crystals, which can form clouds.

2-High pressure is moving into an area: High-pressure systems are associated with clear and sunny weather, so this condition is less likely to lead to the formation of clouds.

3-The air over a large parking lot is warmer in the afternoon than the surrounding park is: This condition can lead to the formation of cumulus clouds as the warm air rises and cools, and water vapor condenses into visible clouds.

4-The horse latitudes are the areas of sinking air: This condition is associated with clear and dry weather, so it is less likely to lead to the formation of clouds.

5-Low pressure moves into your area: This condition can lead to the formation of clouds as the rising warm, moist air cools and condenses into clouds.

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The consequence of having cis configuration in double bonds of unsaturated fatty acids is that it creates a kink or bend in the fatty acid chain, which affects the packing of molecules and the fluidity of the membrane.

The cis configuration of double bonds in unsaturated fatty acids results in a kink or bend in the fatty acid chain. This bend affects the overall structure and function of the fatty acid. It causes the molecules to pack less tightly together, making them more fluid and flexible at room temperature. This property is important for cell membrane function, as it allows the membrane to remain fluid and adaptable to changing environmental conditions.

Additionally, the cis configuration can affect the biological activity of unsaturated fatty acids, influencing their interactions with enzymes and other molecules in the body.

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The net ionic equation for the dissolution of solid cobalt(III) phosphate, CoPO₄(s), in an acid solution can be written as; CoPO₄(s) + 3H₃O⁺(aq) ↔ Co₃⁺(aq) + H₂PO₄⁻(aq) + 3H₂O(l)

In this reaction, CoPO₄(s) reacts with hydronium ions, H₃O⁺(aq), to form cobalt(III) ions, Co₃⁺(aq), and hydrogen phosphate ions, H₂PO₄⁻(aq), along with water molecules, H₂O(l). The hydrogen phosphate ion, H₂PO₄⁻, is the product of the reaction and is formed by the reaction of H₃O⁺ with PO₄³⁻ in CoPO₄(s), which acts as a weak acid.

The net ionic equation only shows the species that are directly involved in the chemical reaction, so the spectator ions, such as counterions, are omitted. In this case, the counterion for CoPO₄ is not included in the net ionic equation since it does not participate in the reaction.

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Answer:

Part 1:

To determine the total change in enthalpy (ΔH) from the diagram, we need to look at the difference between the potential energy of the products and the potential energy of the reactants. In this diagram, the potential energy of the products (point B) is higher than the potential energy of the reactants (point A), so ΔH is positive.

To determine the activation energy (Ea), we need to look at the difference between the potential energy of the reactants and the highest point on the curve, also known as the transition state (point C). In this diagram, the potential energy of the reactants (point A) is lower than the potential energy of the transition state (point C), so Ea is positive.

Part 2:

If the reaction was exothermic, the potential energy of the products would be lower than the potential energy of the reactants. This means that the curve would be inverted, with the potential energy decreasing as the reaction proceeds. The potential energy of the reactants would be higher than the potential energy of the products.

The enthalpy change (ΔH) for an exothermic reaction would be negative, as energy would be released during the reaction. The activation energy (Ea) would still be positive, as the reactants would still need to absorb energy to reach the transition state. However, the height of the curve would be lower for an exothermic reaction, indicating a lower activation energy.

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The base dissociation (Kb) of the fluoride anion is 1.32 × 10⁻¹¹. The value indicates the strength of fluoride ions as a base. The lower the value of Kb, the weaker the base. The Kb of fluoride ions is quite small, indicating that it is a weak base.

To find the Kb of the fluoride anion, we need to use the relationship between the acid dissociation constant, Ka, and the base dissociation constant, Kb, for the conjugate acid-base pair.

The equation for this relationship is:

Ka x Kb = Kw

where Kw is the ion product constant for water, which is equal to 1.0 x 10⁻¹⁴ at 25°C.

In this case, the acid is HF and its conjugate base is F⁻ (fluoride). The student has determined that the Ka of HF is 7.6 x 10⁻⁴.

Therefore, we can use the above equation to solve for the Kb of F⁻:

Ka x Kb = Kw

Kb = Kw / Ka

Kb = 1.0 x 10⁻¹⁴ / 7.6 x 10⁻⁴

Kb = 1.32 x 10⁻¹¹

Therefore, the Kb of the fluoride anion is 1.32 x 10⁻¹¹.

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Answer:

a. diphenylmethanol

Explanation:

As benzaldehyde is used instead of benzophenone, the expected product is Diphenylmethanol.

Benzophenone is a molecule of the ketone type that is made up of two phenyl groups that are bonded to a carbonyl group. In polar solvents, it is a crystalline substance that is almost white, odorless, and has a faintly sweet taste. It is commonly used as a UV light stabilizer for various plastics and as a chemical intermediate in the manufacture of pharmaceuticals, fragrances, and dyes. Diphenylmethanol is an organic compound that belongs to the class of aromatic alcohol. It is a white crystalline substance that has a sweet, floral scent. It is produced by combining benzaldehyde with the Grignard reagent. The reaction will lead to the formation of Diphenylmethanol. Therefore, if benzaldehyde was used instead of benzophenone, the expected product would be Diphenylmethanol.

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a) The reduction reaction is the reaction that occurs at the zinc electrode, which is Zn²⁺(aq) + 2e⁻ → Zn(s).

b) The oxidation reaction is the reaction that occurs at the tin electrode, which is Sn(s) → Sn²⁺(aq) + 2e⁻.

c) The overall reaction is: Sn(s) + Zn²⁺(aq) → Sn²⁺(aq) + Zn(s).

d) The overall voltage for the cell is the difference between these two potentials is -0.62 V.

e) Zn electrode | Zn(NO₃)₂ || SnSO₄ | Sn electrode

f) As the reaction proceeds, the mass of the tin electrode will decrease as tin atoms are oxidized to form Sn²⁺ ions.

To calculate the voltage for this cell, we need to use the standard reduction potentials for the half reactions. The standard reduction potential for the reduction reaction is -0.76 V, and the standard reduction potential for the oxidation reaction is -0.14 V. The overall voltage for the cell is the difference between these two potentials: Ecell = Ered - Eox = (-0.76 V) - (-0.14 V) = -0.62 V.

In a galvanic cell, the reduction reaction occurs at the cathode, while the oxidation reaction occurs at the anode. In this case, the zinc electrode is the cathode, where Zn²⁺ ions are reduced to form zinc atoms. The tin electrode is the anode, where tin atoms are oxidized to form Sn²⁺ ions.

The overall reaction occurs spontaneously, as the standard reduction potential for the reduction reaction is more positive than the standard reduction potential for the oxidation reaction. This means that the electrons will flow from the anode to the cathode, generating an electrical current.

The salt bridge is used to maintain charge neutrality in the two half-cells, as the electrons flow from the anode to the cathode, and ions must move to balance the charges. Na⁺ ions move towards the anode, while NO³⁻ ions move towards the cathode. This allows for the flow of ions to maintain charge neutrality in both half-cells.

As the reaction proceeds, the mass of the tin electrode will decrease as tin atoms are oxidized to form Sn²⁺ ions. Conversely, the mass of the zinc electrode will increase as zinc ions are reduced to form zinc atoms. This is due to the conservation of mass, as the total mass of the system remains constant.

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At the atmospheric pressure on the summit of Mt. Everest (0.333 atm), water boils at a temperature of approximately 2710.39 °C.

In this specific question, we are being asked to calculate the temperature (in °C) at which water boils on the summit of Mt. Everest, given that the atmospheric pressure there is 0.333 atmospheres and ∆Hvap for water is 40.7 kJ/mol.

We can use the Clausius-Clapeyron equation to solve for the boiling point of water at this pressure. The equation is given by:ln(P2/P1) = (∆Hvap/R) * (1/T1 - 1/T2)

where:P1 = 1 atm (standard pressure)

P2 = 0.333 atm (pressure on the summit of Mt. Everest)

∆Hvap = 40.7 kJ/molR = 8.31 J/mol*K (universal gas constant)

T1 = 373 K (boiling point of water at standard pressure)

T2 = ? (boiling point of water at 0.333 atm pressure)

Solving for T2, we get:T2 = T1 * {∆Hvap/R * ln(P2/P1) + 1}T2 = 373 K * {40.7 kJ/mol / (8.31 J/mol*K) *

ln(0.333 atm / 1 atm) + 1}T2 = 373 K * {7.98}T2 = 2983.54 K

We can convert the boiling point of water at 0.333 atm pressure from Kelvin to Celsius by subtracting 273.15 from the result:T2 (in °C) = 2983.54 K - 273.15K = 2710.39 °C

Therefore, at the atmospheric pressure on the summit of Mt. Everest (0.333 atm), water boils at a temperature of approximately 2710.39 °C.

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We learned that k is adsorbed to negatively charged soil colloids by electrostatic attraction to three types of exchange sites or binding positions. The cation exchange sites are the most readily available to the soil solution.

The binding position that is readily available to the soil solution is the cation exchange sites. This is because the negatively charged soil colloids attract positively charged ions, known as cations, through electrostatic attraction. These cations are then exchanged with other cations in the soil solution, leading to the term "cation exchange sites."

The other two types of exchange sites are the anion exchange sites, which attract negatively charged ions, known as anions, and the inner sphere binding sites, which involve a direct bond between the metal ion and the soil colloid surface. However, the cation exchange sites are the most readily available to the soil solution.

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The enthalpy is the principal driving force because it is a large enough negative value to ensure the free energy is negative, making the reaction spontaneous. Hence, option A is correct.

In order to determine the driving force for a reaction, we look at the Gibbs free energy change (ΔG). The Gibbs free energy is given by the equation:

ΔG = ΔH - TΔS

where ΔH is the enthalpy change, T is the temperature in Kelvin, and ΔS is the entropy change. If ΔG is negative, the reaction is spontaneous, meaning that it will occur without any external input of energy. If ΔG is positive, the reaction is nonspontaneous and will only occur with an input of energy.

Assuming that ΔS° is also negative, option A is the best choice, The enthalpy is the principal driving force because it is a large enough negative value to ensure the free energy is negative, making the reaction spontaneous. This option assumes that ΔS° is negative, which would result in a negative ΔG value and a spontaneous reaction.

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--The complete question is, Consider the reaction CO2(g) + 2NH3(g) à CO(NH2)2(s) + H2O(l) ΔH° 298K = -134kJ b. Which factor, the change in enthalpy, ΔH°, or the change in entropy, ΔS° provides the principle driving force for the reaction at 298K? Explain.

A) The enthalpy is the principal driving force because it is a large enough negative value to ensure the free energy is negative, making the reaction spontaneous

B) The enthalpy is the principal driving force because it is a large enough negative value to ensure the free energy is positive, making the reaction nonspontaneous

C) The entropy is the principal driving force, because it is a large enough negative value to ensure the free energy is negative making the reaction spontaneous

D) The entropy is the principal driving force, because it is a large enough negative value to ensure the free energy is positive making the reaction nonspontaneous--

The description that best reflects the strategy "adopt an identity" is: People who wear Nike™ sneakers "just do it" when it comes to challenging physical activity.

"Adopt an identity" is a marketing strategy that appeals to people's sense of self-identity and the desire to express themselves through the brands and products they consume. The Nike™ slogan "just do it" encourages people to identify themselves as athletes or fitness enthusiasts and to associate that identity with the brand. By adopting the identity of a Nike™ wearer, people are not only buying a product but also adopting a lifestyle and a set of values that the brand represents. This strategy is effective because it creates an emotional connection between the consumer and the brand, which can lead to brand loyalty and repeat purchases.

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Charles's Law-

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\star\longrightarrow\sf \underline{\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}\\[/tex]

Where:-

As per question, we are given that -

We are given the initial temperature in °C.So, we first have to convert the temperature in Celsius to kelvin by adding 273-

[tex]\:\:\:\:\:\:\star\sf T_1[/tex] = 65+ 273 =338 K

Now that we have obtained all the required values, so we can put them into the formula and solve for T₂ :-

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\star\longrightarrow\sf \underline{\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow\sf \underline{\dfrac{T_2}{V_2}=\dfrac{T_1}{V_1}}\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow\sf \underline{T_2=\dfrac{T_1}{V_1} \times V_2}\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow\sf T_2=\dfrac{338}{3.75} \times 6.52\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow\sf T_2=90.13333...... \times 6.52\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow\sf T_2=587.669.........\:K\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow\sf T_2=(587.67 -273)°C\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow\sf T_2=314.66933…....\:°C\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow\sf \underline{T_2=314.67\:°C}\\[/tex]

Therefore, the temperature will change from 65°C to 314.67°C, when the volume of a gas is changed from 3.75 L to 6.52 L.

The correct option is d. increment H < 0, incrementS > 0, incrementG < 0.

When NH4NO3 dissolves, the temperature of the water decreases. What are the signs of the changes of H, S, and G for this process?The sign of changes in enthalpy (ΔH) for the dissolution of ammonium nitrate (NH4NO3) in water is negative.

It means that the process releases heat, and it is exothermic. The dissolution of NH4NO3 in water is a spontaneous process and hence its entropy change (ΔS) is positive.

Therefore, the dissolution of NH4NO3 in water leads to an increase in the entropy of the system. Since the dissolution process is exothermic, the change in Gibbs free energy (ΔG) is negative, indicating that it is spontaneous.

Thus, the signs of changes in H, S, and G for the dissolution of ammonium nitrate in water are: ΔH < 0 When NHd ΔG < 0.

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The position of the element in the periodic table influences the cation that it forms.

An ion is a particle that has either a positive or negative charge. Ions are formed by removing or adding electrons from/to an atom or molecule. They could be classified into two categories: cations and anions. Cations are positively charged ions that are formed when an atom loses one or more electrons.

Anions are negatively charged ions that are formed when an atom gains one or more electrons.The position of the element in the periodic table influences the cation that it forms. Because the number of valence electrons changes as we move through the periodic table from left to right or top to bottom, this is the case.

As a result, the chemical properties of the elements change as we move from left to right or top to bottom. This influences the type of cations that are formed because cations are formed by losing electrons. The most prevalent cations are those that result from the loss of one, two, or three electrons by an element. Cations such as H+, Na+, K+, and Ca2+ are formed by metals.

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To determine the selenide ion (Se2-) concentration for a 0.200 M H2S solution that has the stepwise dissociation constant, we need to use the equilibrium constants for the reaction of H2S with water and for the reaction of HSe- with water.

The stepwise dissociation of H2S in water can be represented as:

H2S + H2O ⇌ HS- + H3O+

K1 = [HS-][H3O+] / [H2S]

The stepwise dissociation of HSe- in water can be represented as:

HSe- + H2O ⇌ Se2- + H3O+

K2 = [Se2-][H3O+] / [HSe-]

We are given that the concentration of H2S is 0.200 M. At equilibrium, some of the H2S reacts with water to form HS- and H3O+. We can assume that the initial concentration of H2S is much greater than the concentrations of HS- and H3O+ formed, so we can approximate the concentration of H2S to be 0.200 M at equilibrium. We don't know the concentration of H3O+ at this point, so we will express it in terms of x.

H2S + H2O ⇌ HS- + H3O+

Initial concentration: 0.200M 0 0 0

Change: -x +x +x

Equilibrium concentration: 0.200-x x x -

Now we can use the equilibrium concentrations to calculate the values of K1 and K2 using the given stepwise dissociation constants:

K1 = 1.1 × 10^-7 = [HS-][H3O+] / [H2S]

K2 = 1.3 × 10^-13 = [Se2-][H3O+] / [HSe-]

We can express [HSe-] in terms of [HS-] and [H2S] using the acid dissociation constant expression for H2S:

K1 = [HS-][H3O+] / [H2S]

1.1 × 10^-7 = x^2 / (0.200 - x)

Solving for x, we get:

x = 5.5 × 10^-5 M

This is the concentration of [HS-] and [H3O+] at equilibrium. To find the concentration of [Se2-], we can use the equilibrium constant expression for the reaction of HSe- with water:

K2 = [Se2-][H3O+] / [HSe-]

1.3 × 10^-13 = [Se2-](5.5 × 10^-5) / (0.200 - 5.5 × 10^-5)

Solving for [Se2-], we get:

[Se2-] = 2.6 × 10^-14 M

Therefore, the selenide ion concentration for a 0.200 M H2S solution that has the stepwise dissociation constant is 2.6 × 10^-14 M.

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