We’re learning about mole I need help on these last questions of my chemistry packet please help me
Answers
Answer:
1. [tex]2.879 * 10^{23}[/tex] atoms of AgCl
2. [tex]1.96 * 10^{7}[/tex] g of Bi
3. [tex]C_2H_8O[/tex]
Bonus: [tex]8.31*10^{23}atomsC[/tex]
Explanation:
1) If there are 68.54 grams of silver chloride, first know the chemical formula of silver chloride is AgCl. Then, you can use the molar mass of AgCl, found by adding the molar mass of its constituent elements on the periodic table, and unit conversions to solve for the amount of atoms of AgCl. Keep in mind that Avogadro's number states that there are [tex]6.02 * 10^{23}[/tex] atoms in one mole of a substance. Keep in mind that your answer will have four significant figures.
[tex]68.54 grams AgCl* \frac{1 mol AgCl}{(107.87gAg + 35.45gCl)} *\frac{6.02*10^{23}atoms}{1 mol} = 2.879 atomsAgCl[/tex]
2) If there are [tex]5.64 * 10^{28}[/tex] atoms of bismuth, you can use the molar mass of Bi found on your periodic table and constants in order to calculate the mass of Bi.
[tex]5.64*10^{28}atoms Bi * \frac{1 mol Bi}{6.02 * 10^{23}atoms Bi} * \frac{208.98gBi}{1 molBi} = 1.96 * 10^7gBi[/tex]
4) When asked for the empirical formula, recall that the empirical formula of a compound differs from its chemical formula, as the empirical formula is essentially the "greatest common factor" version of a chemical formula. For example, glucose, [tex]C_{6} H_{12}O_{6}[/tex], and acetic acid, [tex]CH_3COOH[/tex] (or [tex]C_2H_4O_2[/tex]) have different chemical formulas, but their empirical formulas are the same, represented as [tex]CH_2O[/tex], where the greatest common factor 6 is factored out of glucose to obtain this formula, while the greatest common factor 2 is factored out of acetic acid.
Given this information, you can imagine that there are 100g of carbon, hydrogen, and oxygen in this compound, so that the percentages given are easy to convert into mass. (Note that since empirical formula is a simplified form, the molar mass of the compound won't matter). This gives us a compound with 50.0g of carbon, 33.3g of oxygen, and 16.7g of hydrogen. We can then convert those values into moles:
[tex]50.0gC * \frac{1molC}{12.01gC} = 4.16molC\\33.3gO * \frac{1molO}{16.00gO} = 2.08molO\\16.7gH * \frac{1 mol H}{1.01gH} = 16.5molH[/tex]
Now, you can express a formula for this compound as [tex]C_{4.16}H_{16.5}O_{2.08}[/tex].
The lowest of these numbers is 2.08, or the number of moles of O in the formula. Dividing each of the subscripts by 2.08 will result in the following formula:
[tex]C_{4.16/2.08}H_{16.5/2.08}O_{2.08/2.08} = C_2H_8O[/tex]
Note: Depending on if 1.00g/mol or 1.01g/mol was used for the molar mass of hydrogen, either 7.93 or 8.03 would be found to be the subscript of H. This is simply factored out by rounding either value to simply 8.
Bonus) Knowing that there are 25.6g of the substance in question, we can simply find 64.9% (the percent composition by mass of carbon for the unkown compound) of the total mass of the unknown compound.
[tex]25.6g * 0.649 = 16.6gC[/tex]
Now, simply use the molar mass of carbon, 12.01g/mol, to find the moles of carbon present.
[tex]16.6gC * \frac{1molC}{12.01gC} = 1.38molC[/tex]
Now, using Avogadro's number, convert from moles to atoms. Keep in mind that your answer will have three significant figures.
[tex]1.38molC * \frac{6.02*10^{23}atomsC}{1molC} = 8.31*10^{23}atomsC[/tex]
Related Questions
Why must chemical equations be balanced? (Choose all that apply.)
Two substances must make a new substance.
All atoms on both sides of an equation must be the same.
All atoms on both sides of an equation must be in equal amounts.
It is needed in order to add coefficients.
It will satisfy the law of conservation of mass.
Answers
Answer:
It will satisfy the law of conservation of mass.
Two substances must make a new substance.
All atoms on both sides of an equation must be the same.
Explanation:
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How many molecules are there in 2.3 grams NH3
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Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:
2.30 g NH3 (1 mol / 17.03 g ) (6.022 x 10^23 molecules / 1 mol ) = 8.13x10^22 molecules
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()bao2 ()h2so4 → ()h2o2 ()baso4
Answers
Based on the chemical equation, the value of coefficient that is used in the reaction is 1.
What is balanced equation?Balanced chemical equations are those equation in which each entities are present in same amount on left side as well as on the right side of the chemical reaction.
Given chemical reaction is:
BaO₂ + H₂SO₄ → H₂O₂ + BaSO₄
Above reaction is balanced as all elements are present in same amount on both sides. So, the value of coefficients is 1.
Hence the required coefficients is 1.
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What is TVEL (nuclear fuel cycle) special features that use Nuclear Technology?
Answers
Answer:
TVEL is developing mixed-oxide (MOX) fuel and REMIX fuel, with both using recycled uranium together with plutonium. This is the dual-component approach. "We're very actively engaged in this and right now it is cost-intensive,"
Answer:
Brainliest pls
Explanation:
The nuclear fuel cycle consists of several steps: mining, milling, conversion, enrichment, fuel fabrication, and electricity generation.
What happens during reduction?
Loss of electrons
Gain of electrons
Loss of protons
Gain of protons
Answers
Magnesium loses electrons and loss of electrons is oxidation. Copper (II) ions gain electrons and gain of electrons is reduction. Redox is when oxidation and reduction occur simultaneously in the same reaction.
Answer:
Gains of electrons
Some greenhouse gases, such as fluorocarbons (CFCs, HFCs, PFCs, etc. ), are human-made. Others, such as water, methane, and carbon dioxide, are naturally produced. Which type of greenhouse gas (human-made or natural) is more difficult to control and eliminate? Which types are easier? In three to five sentences, provide evidence for your argument
Answers
The green house gases are those gases that are known to prevent the escape of infrared rays.
What are green house gases?The green house gases are those gases that are known to prevent the escape of infrared rays and ultimately lead to an increase in the temperature of the earth.
These green house gases could be natural or artificial. The natural greenhouses gases are more difficult to control because they can alaso be produced in natural processess that are not subject to human control.
For instance, there are process in the ocean that produce methane and this gas is also produced by decomposition in nature. This makes the control of the gas not entirely within the control of man.
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If a ratio of two elements in a chemical formula is 1:1, does this necessarily mean that the number of atoms of each element is 1 ? Explain your answer
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Answer:
i do not know sorry i such at this hope you find the answer.
ratio = 1 : 1
the number of atoms can be 1: 1, 2:2, 3:3 etc
How do gravitational forces impact the motion of earth and moon?
Answers
Answer:
The Gravitational Force of the Earth and Moon on Each Other. According to Newton's Third Law of Motion, the Law of Action and Reaction, if the Earth exerts a force on the Moon, the Moon must exert an equal and opposite force on the Earth.
Conclusion: Write a conclusion statement that addresses the following questions: How did your experimental absolute zero value compare to the accepted value? Does your data support or fail to support your hypothesis (include examples)? Discuss any possible sources of error that could have impacted the results of this lab. How do you think the investigation can be explored further? Post-Lab Reflection Questions Answer the reflection questions using what you have learned from the lesson and your experimental data. It will be helpful to refer to your chemistry journal notes. Answer questions in complete sentences. Why was the line of best fit method used to determine the experimental value of absolute zero? Which gas law is this experiment investigating? How does your graph represent the gas law under investigation? Using your knowledge of the kinetic molecular theory of gases, describe the relationship between volume and temperature of an ideal gas. Explain how this is reflected in your lab data. Pressure and number of moles remained constant during this experiment. If you wanted to test one of these variables in a future experiment, how would you use your knowledge of gas laws to set up the investigation?
Answers
Answer:
Brainliest pls
Explanation:
Although the information for the trial was not given, we can offer a summed-up reply in that while playing out an analysis to accomplish outright zero temperatures, the worth won't ever match the specific worth.
What is absolute zero?
Absolute zero is the lower furthest reaches of temperature. Considered the coldest conceivable temperature that can exist. Nonetheless, any endeavor to arrive at this temperature in a controlled climate has fizzled, researchers don't think reproducing this temperature is conceivable.
In this way, we can affirm that the worth of indisputably the zero tests didn't match the acknowledged worth. Assuming the speculation was that it would be troublesome or difficult to accomplish, then the information would uphold the theory, if not, it would neglect to do as such.
In outline, outright zero is a temperature that can't be reproduced in a lab, so the worth in this analysis doesn't match the acknowledged worth and there could be no further investigation to be done on this.
Which statement is NOT true about the human sperm cell?
composed of a "head" and "tail"
one of the smallest cells in the male body
the flagella(tail) is used for motility
all of the above are true
Answers
Answer:
all of the above
Explanation:
Consider the following equilibrium: upper c upper o (g) plus 2 upper h subscript 2 (g) double arrow upper c upper h subscript 3 upper o upper h (g). k subscript e q equals 26. which statement about this system is true? if the equilibrium concentration of co is 3.4 × 10–1 m, and the equilibrium concentration of h2 is 6.8 × 10–1 m, the equilibrium concentration of ch3oh is
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The equilibrium concentration of CH3OH will be equal to 0.089 if the equilibrium concentration of co is 3.4 × 10–1 m, and the equilibrium concentration of h2 is 6.8 × 10–1 m
What is equilibrium concentration?An equilibrium concentration is a state when the rate of forward reaction in a chemical reaction becomes equal to the rate of backward reaction
Step 1:
The balanced equation for the reaction is given below:
H2O + Cl2O <=> 2HClO
Step 2:
Data obtained from the question. This includes:
Concentration of H2O, [H2O] = 0.077 M
Concentration of Cl2O, [Cl2O] = 0.077 M
Concentration of HClO, [HClO] = 0.023 M
Equilibrium constant, K =?
Step 3:
Determination of the equilibrium constant. This is illustrated below:
The equilibrium constant for the above reaction is given below:
K = [HClO]^2 / [H2O] [Cl2O]
K = (0.023)^2 / (0.077 x 0.077)
K = 0.089
Therefore, the equilibrium constant for the above reaction is 0.089
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Which of the following converts chemical energy to electrical energy? Question 2 options: Camp fire Person eating food Battery Automobile
Answers
Answer:
battery
Explanation:
the answer is C
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Describe how Fire Making undergo heat to light energy transformation.
Answers
As the combustible materials burn, some of the chemical energy is transformed into heat energy, and some are transformed into light energy. Light energy, also known as radiation or electromagnetic energy, is a type of kinetic energy that takes the form of visible light waves, such as the light from a match.
How many moles of calcium acetate are needed to react with 5.00 moles of sodium carbonate?
Answers
Answer:
[tex]5.00 moles Ca(C_2H_3O_2)[/tex]
Explanation:
First find the chemical formula for this reaction:
[tex]Ca(C_2H_3O_2) + Na_2CO_3 - > CaCO_3 + 2NaC_2H_3O_2[/tex]
Knowing from the chemical formula that one mole of calium acetate will react with one mole of sodium carbonate can be used to find how many moles of calcium acetate react with 5.00 moles of sodium carbonate:
[tex]5.00 molNa_2CO_3 * \frac{1 molCa(C_2H_3O_2)}{1 mol Na_2CO_3} = 5.00 mol Ca(C_2H_3O_2)[/tex]
Remember that your answer needs to have three significant figures.
In redox reactions, electrons are ____.
A)shared
B)lost
C)transferred
D)not needed
Answers
Answer:
C
Explanation:
This is the only option that gives the right option as in redox reaction electron are lost and gained by different atoms. Not shared or not needed are not right
composed of an organic matrix, which gives it tensile strength; it is composed an inorganic calcified matrix, which gives it hardness. __________ is a condition, whereby a certain amount of bone density is loss; it then involves loss of both matrices.
Answers
Bone is composed calcified matrix, which gives it hardness. The loss of this bone hardness is called Osteopenia.
Loss of bone strengthBone is an organic matrix that is highy reinforced by inorgaanic minerals such as calcium. Bone is known to be intricated laced in a calcified matrix, which gives it hardness.
The loss of this bone density and consequent loss of the rigidity of the bone is called Osteopenia.
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Calculate the vapour density of a
diatomic gas X, if its relative mass is 16
Answers
From the information, the vapor density of gas X is obtained as 8. The vapor density is half of the relative molecular mass of the compound.
What is vapor density?The term vapor density is defines as half of the relative molecular mass of a compound. Now we have the relative molecular mass of the compound as 16.
It the follows that the vapor density of the compound must be 16/2. Hence, the vapor density of the diatomic gas X is 8.
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A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO2 drops to 50 mm Hg. What other change would occur
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The central region of an atom where its neutrons and protons are is its:.
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how many protons, neutrons and electrons? please help
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Hence it has 27 protons
In a neutral atom the electrons equals the protons but this is an ion (cation that has given out 2 electrons) and so has electrons being (27 - 2)= 25
Neutron number is the difference between the mass number and proton number.i.e neutrons = 62-27 =35
Protons = 27
Electrons = 25
Neutrons = 35
What is Arrhenius's definition of an acid?
a substance that dissociates in water to produce hydroxide ions (OH)
O a substance that dissociates in water to produce hydrogen ions (H+)
O any substance that can donate hydrogen ions (H+).
O
any substance that can accept hydrogen ions (H+)
Answers
Arrhenius: an acid is a substance which when dissolved in water will release H⁺ ions.
HₓY(aq) ⇒ xH⁺(aq) + Yˣ-(aq)
Particles
How many moles of water are
in 1.23x1018 water molecules?
[ ? ]x10[?]
Enter your answer with the correct
number of significant figures and be sure
the prefix is a number between 1 and 10!
а
Prefix (green)
Exponent (yellow)
Answers
Answer:
Explanation:
The moles have been the mass of the molecule that has been present with respect to the molecular mass of the compound. The number of molecules that have been present in a mole of the compound has been equivalent to the Avogadro number.
The Avogadro number has been constant with a value of 6.023 .
Thus, the number of molecules in a mole of the compound has been given by:
1 mole = 6.023 molecules
The given molecules of water have been . The moles of the water molecule has been given by:
6.023 molecules = 1 mole of water
molecules =
The moles of water have been = 2.04
Thus, the mole of water that has been consisting of molecules has been 2.04 mol.
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A reaction that involves the transfer of electrons from one molecule to another is referred to as an oxidation reaction. a redox reaction. a reduction reaction.
Answers
Answer:
Terms in this set (31) A reaction that involves the transfer of electrons from one molecule to another is referred to as. a redox reaction. During an oxidation reaction, the donor molecule loses an electron and becomes oxidized.
Explanation:
hope this helps<33
What is the minimum internal cooking temperature for ground beef?.
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question for smart people
Answers
#a
pH+pOH=14pOH=14-9.50pOH=4.50#b
[H+] be x
-logx=9.50logx=-9.5x=10^{-9.5}x=3.2×10^-10M#c
basic as pH is 9.5>7
An automobile battery that uses 2520W of power is connected to an electric
starter motor. How many joules of energy does the battery deliver to the motor
each second?
Answers
Answer:
Explanation: current= watts divided by voltage= 75/120= 0.625 amperes.Jan 14, 2017
which of the following charecteristics will not help u tell whether two solids are the same or are diferent substances?
Answers
Answer:
D. Melting point
Explanation:
A. Color
B. Hardness
C. Shape
D. Melting point
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Compare how entropy changes for the following two systems:
System A: A gas and a solid react to form a new solid product.
System B: Rubbing alcohol evaporates on the skin
Answers
In system A: A gas and a solid react to form a new solid product. The system entropy decreases.
In System B: Rubbing alcohol evaporates on the skin. Liquid alcohol is converted to gas by evaporation. So the system entropy increases.
What is Entropy?Entropy is a thermodynamic quantity measure the degree of disorder of a certain system.
Gases have larger entropy compared to liquids and which is larger than solids.
System A: When a gas convert to a solid, its entropy decreases because solids have less energy and entropy than solids.So, in system A: A gas and a solid react to form a new solid product. The system entropy decreases.System B: Any chemical reaction that increases the number of gas molecules also increases entropy.So, in System B: Rubbing alcohol evaporates on the skin. Liquid alcohol is converted to gas by evaporation. So the system entropy increases.Learn more about entropy here:
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Answer:
System A: The entropy decreases due to the solid having fewer moving particles than the gas .
System B: There is an increase in entropy. The change in the state of a liquid to a gas is an increase in entropy (disorder) because the particles of a gas are moving faster and forming more random arrangements than they are in the more condensed liquid state.
Explanation:
What would the concentration of an NaOH solution be if 25 moles were used and 50 L were used?
0.5 M
0.5 M
2 M
, 2 M
1250 M
1250 M
25 M
Answers
Answer: 0.5 M
Explanation:
What is the relationship between a solution and a mixture.
Answers
Answer: In a mixture, substances are generally just mixed and are not completely dissolved. In a solution, substances are dissolved completely and they cannot be filtered out.
Explanation: