Question 1

How many grams of chlorine gas are needed to make 117 grams of sodium chloride? 
Given the reaction: 
2Na + Cl2 → 2NaCl

Accepted Answer

A) 71.0 
B) 142 
C) 35.5 
D) 48.2 
E) not enough information 
A) 71.0 
B) 142 
C) 35.5 
D) 48.2 
E) not enough information A

Question 2

Calculate the maximum number of grams of NH3 that can be produced by the reaction of  2.00 g of N2 with 3.00 g H2. 
Reaction: N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A) 0.964 
B) 2.43 
C) 4.00 
D) 17.0 
E) none of the above 
A) 0.964 
B) 2.43 
C) 4.00 
D) 17.0 
E) none of the above B

Question 3

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4? 
Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2

Accepted Answer

A) Ca(NO3)2 
B) Li3PO4 
C) LiNO3 
D) Ca3(PO4)2 
E) not enough information 
A) Ca(NO3)2 
B) Li3PO4 
C) LiNO3 
D) Ca3(PO4)2 
E) not enough information B

Question 4

How many moles of H2 can be made from complete reaction of 3.0 moles of Al? Given: 
2 Al + 6 HCl → 2 AlCl3 + 3 H2

Accepted Answer

A) 3 moles 
B) 3.0 moles 
C) 4.5 moles 
D) 9.0 moles 
E) none of the above 
A) 3 moles 
B) 3.0 moles 
C) 4.5 moles 
D) 9.0 moles 
E) none of the above

Question 5

Consider the following equation: CO + 2 H2 → CH3OH △H rxn = -128 kJ Calculate the amount of heat (in kJ)associated with complete reaction of 8.08 g H2.

Accepted Answer

A) -1024 kJ 
B) -1034 kJ 
C) -256 kJ 
D) -512 kJ 
E) none of the above 
A) -1024 kJ 
B) -1034 kJ 
C) -256 kJ 
D) -512 kJ 
E) none of the above

Question 6

If 16.0 grams of aluminum oxide were actually produced,what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? 
Reaction: 4Al + 3O2 → 2Al2O3

Accepted Answer

A) 75.0% 
B) 100% 
C) 84.7% 
D) 39.6% 
E) not enough information 
A) 75.0% 
B) 100% 
C) 84.7% 
D) 39.6% 
E) not enough information

Question 7

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen.
2H2 + O2 → 2H2O
The theoretical yield of the reaction is 4 grams of water.

Accepted Answer

A) True 
 B)False

Question 8

How many eggs are needed to make 1 dozen waffles,assuming you have enough of all other ingredients? 
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

A) 48 
B) 9 
C) 12 
D) 16 
E) not enough information 
A) 48 
B) 9 
C) 12 
D) 16 
E) not enough information

Question 9

A chemist wishes to perform the following reaction: N2 + 3 H2 → 2 NH3 If only 14.0 g of N2 is available,what is the minimum amount,in grams,of H2 needed to completely react with this quantity of N2?

Accepted Answer

A) 1.01 g 
B) 1.51 g 
C) 3.03 g 
D) 6.06 g 
E) none of the above 
A) 1.01 g 
B) 1.51 g 
C) 3.03 g 
D) 6.06 g 
E) none of the above

Question 10

Which is the limiting reactant in the following reaction given that you start with   of CO2 and  99.9 g  KOH? 
Reaction: CO2 + 2KOH → K2CO3 + H2O

Accepted Answer

A) K2CO3 
B) H2O 
C) CO2 
D) KOH 
E) not enough information 
A) K2CO3 
B) H2O 
C) CO2 
D) KOH 
E) not enough information

Question 11

When viewing a chemical equation,the limiting reactant can never be a chemical on the product side of the equation.

Accepted Answer

A) True 
 B)False

Question 12

Suppose a computer manufacturer can build circuit boards according to the following process: 12 resistors + 20 insulators + 8 memory chips → 4 circuit boards.
How many circuit boards could you make using 30 insulators,assuming you have enough of all the other parts?

Accepted Answer

A) 20 
B) 4 
C) 10 
D) 6 
E) none of the above 
A) 20 
B) 4 
C) 10 
D) 6 
E) none of the above

Question 13

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? 
Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2

Accepted Answer

A) 0.7 
B) 1.0 
C) 1.4 
D) 1.3 
E) not enough information 
A) 0.7 
B) 1.0 
C) 1.4 
D) 1.3 
E) not enough information

Question 14

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen.
2H2 + O2 → 2H2O
The limiting reagent is the oxygen.

Accepted Answer

A) True 
 B)False

Question 15

The actual yield is the same as the theoretical yield if the reaction goes to completion and there is no loss of product.

Accepted Answer

A) True 
 B)False

Question 16

A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of   3.85  g NH3.What is the percent yield for this reaction? 
Reaction: N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A) 86.8% 
B) 73.6% 
C) 26.4% 
D) 13.2% 
E) none of the above 
A) 86.8% 
B) 73.6% 
C) 26.4% 
D) 13.2% 
E) none of the above

Question 17

Consider the following reaction: 2 Mg + O2 → 2 MgO △H rxn = -1203 kJ Calculate the amount of heat (in kJ)associated with complete reaction of 4 moles of Mg.

Accepted Answer

A) -1203 kJ 
B) -2406 kJ 
C) -601.5 kJ 
D) -4812 kJ 
E) none of the above 
A) -1203 kJ 
B) -2406 kJ 
C) -601.5 kJ 
D) -4812 kJ 
E) none of the above

Question 18

What is the theoretical yield in grams of CuS for the following reaction given that you start with   of Na2S and   CuSO4? 
Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Accepted Answer

A) 0.0758 
B) 0.198 
C) 18.93 
D) 7.25 
E) not enough information 
A) 0.0758 
B) 0.198 
C) 18.93 
D) 7.25 
E) not enough information

Question 19

Given the following generic equation,2 A + 3B → A2B3 △H rxn = +444 kJ,if you completely reacted 1 mole of compound A,the amount of heat absorbed would be 222 kJ.

Accepted Answer

A) True 
 B)False

Question 20

Given the balanced equation CH4 + 2 O2 → CO2 + 2 H2O,which of the following is NOT a correct conversion factor?

Accepted Answer

A) 2 mole H2O = 18.02 g 
B) 1 mole O2 = 32.00 g 
C) 1 mole CH4   2 mole H2O 
D) 2 mole O2   1 mole CO2 
E) none of the above 
A) 2 mole H2O = 18.02 g 
B) 1 mole O2 = 32.00 g 
C) 1 mole CH4   2 mole H2O 
D) 2 mole O2   1 mole CO2 
E) none of the above

How many grams of chlorine gas are needed to make 117 grams of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

Calculate the maximum number of grams of NH₃ that can be produced by the reaction of 2.00 g of N₂ with 3.00 g H₂. Reaction: N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO₃)₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃)₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄)₂

How many moles of H₂ can be made from complete reaction of 3.0 moles of Al? Given: 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂

Consider the following equation: CO + 2 H₂ → CH₃OH △H rxn = -128 kJ Calculate the amount of heat (in kJ)associated with complete reaction of 8.08 g H₂.

If 16.0 grams of aluminum oxide were actually produced,what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H₂ + O₂ → 2H₂O The theoretical yield of the reaction is 4 grams of water.

How many eggs are needed to make 1 dozen waffles,assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

A chemist wishes to perform the following reaction: N₂ + 3 H₂ → 2 NH₃ If only 14.0 g of N₂ is available,what is the minimum amount,in grams,of H₂ needed to completely react with this quantity of N₂?

Which is the limiting reactant in the following reaction given that you start with of CO₂ and 99.9 g KOH? Reaction: CO₂ + 2KOH→ K₂CO₃ + H₂O

When viewing a chemical equation,the limiting reactant can never be a chemical on the product side of the equation.

Suppose a computer manufacturer can build circuit boards according to the following process: 12 resistors + 20 insulators + 8 memory chips → 4 circuit boards. How many circuit boards could you make using 30 insulators,assuming you have enough of all the other parts?

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)₂? Reaction: 2HCl + Ca(OH)₂→ 2H₂O+ CaCl₂

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H₂ + O₂ → 2H₂O The limiting reagent is the oxygen.

The actual yield is the same as the theoretical yield if the reaction goes to completion and there is no loss of product.

A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 3.85 g NH₃.What is the percent yield for this reaction? Reaction: N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

Consider the following reaction: 2 Mg + O₂ → 2 MgO △H _rxn = -1203 kJ Calculate the amount of heat (in kJ)associated with complete reaction of 4 moles of Mg.

What is the theoretical yield in grams of CuS for the following reaction given that you start with of Na₂S and CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

Given the following generic equation,2 A + 3B → A₂B₃ △H rxn = +444 kJ,if you completely reacted 1 mole of compound A,the amount of heat absorbed would be 222 kJ.

Given the balanced equation CH₄ + 2 O₂ → CO₂ + 2 H₂O,which of the following is NOT a correct conversion factor?

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Exam 8: Quantities in Chemical Reactions

How many grams of chlorine gas are needed to make 117 grams of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl

Calculate the maximum number of grams of NH3 that can be produced by the reaction of 2.00 g of N2 with 3.00 g H2. Reaction: N2(g)+ 3 H2(g)→ 2 NH3(g)

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2

How many moles of H2 can be made from complete reaction of 3.0 moles of Al? Given: 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Consider the following equation: CO + 2 H2 → CH3OH △H rxn = -128 kJ Calculate the amount of heat (in kJ)associated with complete reaction of 8.08 g H2.

If 16.0 grams of aluminum oxide were actually produced,what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H2 + O2 → 2H2O The theoretical yield of the reaction is 4 grams of water.

How many eggs are needed to make 1 dozen waffles,assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

A chemist wishes to perform the following reaction: N2 + 3 H2 → 2 NH3 If only 14.0 g of N2 is available,what is the minimum amount,in grams,of H2 needed to completely react with this quantity of N2?

Which is the limiting reactant in the following reaction given that you start with of CO2 and 99.9 g KOH? Reaction: CO2 + 2KOH → K2CO3 + H2O

When viewing a chemical equation,the limiting reactant can never be a chemical on the product side of the equation.

Suppose a computer manufacturer can build circuit boards according to the following process: 12 resistors + 20 insulators + 8 memory chips → 4 circuit boards. How many circuit boards could you make using 30 insulators,assuming you have enough of all the other parts?

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H2 + O2 → 2H2O The limiting reagent is the oxygen.

The actual yield is the same as the theoretical yield if the reaction goes to completion and there is no loss of product.

A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 3.85 g NH3.What is the percent yield for this reaction? Reaction: N2(g)+ 3 H2(g)→ 2 NH3(g)

Consider the following reaction: 2 Mg + O2 → 2 MgO △H rxn = -1203 kJ Calculate the amount of heat (in kJ)associated with complete reaction of 4 moles of Mg.

What is the theoretical yield in grams of CuS for the following reaction given that you start with of Na2S and CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Given the following generic equation,2 A + 3B → A2B3 △H rxn = +444 kJ,if you completely reacted 1 mole of compound A,the amount of heat absorbed would be 222 kJ.

Given the balanced equation CH4 + 2 O2 → CO2 + 2 H2O,which of the following is NOT a correct conversion factor?

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Chemical Reactions

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Solutions

Acids and Bases

Chemical Equilibrium

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How many grams of chlorine gas are needed to make 117 grams of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

Calculate the maximum number of grams of NH₃ that can be produced by the reaction of 2.00 g of N₂ with 3.00 g H₂. Reaction: N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO₃)₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃)₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄)₂

How many moles of H₂ can be made from complete reaction of 3.0 moles of Al? Given: 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂

Consider the following equation: CO + 2 H₂ → CH₃OH △H rxn = -128 kJ Calculate the amount of heat (in kJ)associated with complete reaction of 8.08 g H₂.

If 16.0 grams of aluminum oxide were actually produced,what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H₂ + O₂ → 2H₂O The theoretical yield of the reaction is 4 grams of water.

A chemist wishes to perform the following reaction: N₂ + 3 H₂ → 2 NH₃ If only 14.0 g of N₂ is available,what is the minimum amount,in grams,of H₂ needed to completely react with this quantity of N₂?

Which is the limiting reactant in the following reaction given that you start with of CO₂ and 99.9 g KOH? Reaction: CO₂ + 2KOH→ K₂CO₃ + H₂O

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)₂? Reaction: 2HCl + Ca(OH)₂→ 2H₂O+ CaCl₂

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H₂ + O₂ → 2H₂O The limiting reagent is the oxygen.

A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 3.85 g NH₃.What is the percent yield for this reaction? Reaction: N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

Consider the following reaction: 2 Mg + O₂ → 2 MgO △H _rxn = -1203 kJ Calculate the amount of heat (in kJ)associated with complete reaction of 4 moles of Mg.

What is the theoretical yield in grams of CuS for the following reaction given that you start with of Na₂S and CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

Given the following generic equation,2 A + 3B → A₂B₃ △H rxn = +444 kJ,if you completely reacted 1 mole of compound A,the amount of heat absorbed would be 222 kJ.

Given the balanced equation CH₄ + 2 O₂ → CO₂ + 2 H₂O,which of the following is NOT a correct conversion factor?