Question 1

How many grams of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2?
Reaction: 4Al + 3O2 → 2Al2O3

Accepted Answer

A) 40.4 
B) 5.00 
C) 0.185 
D) 18.9 
E) not enough information

Question 2

Given the balanced equation CO2 + Si → SiO2 + C,if you were to react 1 mole of CO2 with 1 mole of Si,which statement is TRUE?

Accepted Answer

A) The CO2 is the limiting reactant. 
B) The Si is the limiting reactant. 
C) The SiO2 is the limiting reactant. 
D) You have equal stoichiometric amounts of reactants. 
E) none of the above

Question 3

Given the chemical equation: 2 Ca + O2 → 2 CaO,
if 2 moles of CaO are formed in this reaction,then 2 moles of O2 must have reacted.

Accepted Answer

A) True 
 B)False

Question 4

If the theoretical yield of a reaction is 144 grams and the actual yield of the reaction is 72 grams,the percent yield of the reaction is 200%.

Accepted Answer

A) True 
 B)False

Question 5

A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO.Calculate the percent yield.
Reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O

Accepted Answer

A) 15 % 
B) 30% 
C) 60% 
D) 70% 
E) none of the above

Question 6

How many moles of aluminum are needed to make 9 moles of molecular hydrogen?
Given the reaction: 2 Al + 6 HCl → 2 AlCl3 + 3H2

Accepted Answer

A) 2 moles 
B) 3 moles 
C) 4 moles 
D) 6 moles 
E) none of the above

Question 7

How many moles of NH3 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) 0.143 
B) 0.0567 
C) 0.235 
D) 1.00 
E) none of the above

Question 8

What is the theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield?

Accepted Answer

A) 28.4 
B) 22.0 
C) 3.52 
D) 352 
E) none of the above

Question 9

How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO3)2 and 2.40 moles of Li3PO4?
Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2

Accepted Answer

A) 310 
B) 248 
C) 1054 
D) 351 
E) not enough information

Question 10

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 11

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals.
If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled.

Accepted Answer

A) tires 
B) frames 
C) pedals 
D) both tires and frames are limiting 
E) not enough information

Question 12

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins.
You can make 9 muffins from 3.5 cups of flour.

Accepted Answer

A) True 
 B)False

Question 13

The limiting reactant determines what the actual yield is.

Accepted Answer

A) True 
 B)False

Question 14

How many moles of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2?
Reaction: 4Al + 3O2 → 2Al2O3

Accepted Answer

A) 0.396 
B) 0.185 
C) 0.741 
D) 5.00 
E) not enough information

Question 15

The conversion factor for moles of carbon dioxide to mass of carbon dioxide is:
1 mole CO2 ≡ 44.01 g

Accepted Answer

A) True 
 B)False

Question 16

How many moles of water are needed to react with 2.2 moles of Li2O?
Given: Li2O + H2O → 2 LiOH

Accepted Answer

A) 4.4 
B) 1.1 
C) 1.5 
D) 2.2 
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

Question 18

What is the limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO2?
Reaction: C + SiO2 → SiC + O2

Accepted Answer

A) C 
B) SiO2 
C) SiC 
D) O2 
E) There is no limiting reactant.

Question 19

How many moles of water are made from complete reaction of 1.4 moles of hydrogen gas?
Given the reaction: 2H2 + O2 → 2H2O

Accepted Answer

A) 2.8 
B) 0.7 
C) 1.4 
D) 2.1 
E) not enough information

Question 20

Given the reaction: 2 Na(s)+ Cl2(g)→ 2 NaCl(s)
The conversion factor for chlorine gas to sodium metal is: 2 mol Cl ≡ 2 mol Na

Accepted Answer

A) True 
 B)False

Exam 8: Quantities in Chemical Reactions

How many grams of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

Given the balanced equation CO₂ + Si → SiO₂ + C,if you were to react 1 mole of CO₂ with 1 mole of Si,which statement is TRUE?

Given the chemical equation: 2 Ca + O₂ → 2 CaO, if 2 moles of CaO are formed in this reaction,then 2 moles of O₂ must have reacted.

If the theoretical yield of a reaction is 144 grams and the actual yield of the reaction is 72 grams,the percent yield of the reaction is 200%.

A sample of 8.5 g NH₃on oxidation produces 4.5 g of NO.Calculate the percent yield. Reaction: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2 Al + 6 HCl → 2 AlCl₃ + 3H₂

How many moles of NH₃ 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 theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield?

How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO₃) ₂ and 2.40 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

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.

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals. If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled.

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins. You can make 9 muffins from 3.5 cups of flour.

The limiting reactant determines what the actual yield is.

How many moles of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

The conversion factor for moles of carbon dioxide to mass of carbon dioxide is: 1 mole CO₂ ≡ 44.01 g

How many moles of water are needed to react with 2.2 moles of Li₂O? Given: Li₂O + H₂O → 2 LiOH

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 limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO₂? Reaction: C + SiO₂ → SiC + O₂

How many moles of water are made from complete reaction of 1.4 moles of hydrogen gas? Given the reaction: 2H₂ + O₂ → 2H₂O

Given the reaction: 2 Na(s)+ Cl₂(g)→ 2 NaCl(s) The conversion factor for chlorine gas to sodium metal is: 2 mol Cl ≡ 2 mol Na

Exam 8: Quantities in Chemical Reactions

How many grams of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3

Given the balanced equation CO2 + Si → SiO2 + C,if you were to react 1 mole of CO2 with 1 mole of Si,which statement is TRUE?

Given the chemical equation: 2 Ca + O2 → 2 CaO, if 2 moles of CaO are formed in this reaction,then 2 moles of O2 must have reacted.

If the theoretical yield of a reaction is 144 grams and the actual yield of the reaction is 72 grams,the percent yield of the reaction is 200%.

A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO.Calculate the percent yield. Reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O

How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2 Al + 6 HCl → 2 AlCl3 + 3H2

How many moles of NH3 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 theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield?

How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO3) 2 and 2.40 moles of Li3PO4? Reaction: 3Ca(NO3) 2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4) 2

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.

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals. If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled.

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins. You can make 9 muffins from 3.5 cups of flour.

The limiting reactant determines what the actual yield is.

How many moles of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3

The conversion factor for moles of carbon dioxide to mass of carbon dioxide is: 1 mole CO2 ≡ 44.01 g

How many moles of water are needed to react with 2.2 moles of Li2O? Given: Li2O + H2O → 2 LiOH

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 limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO2? Reaction: C + SiO2 → SiC + O2

How many moles of water are made from complete reaction of 1.4 moles of hydrogen gas? Given the reaction: 2H2 + O2 → 2H2O

Given the reaction: 2 Na(s)+ Cl2(g)→ 2 NaCl(s) The conversion factor for chlorine gas to sodium metal is: 2 mol Cl ≡ 2 mol Na

How many grams of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

Given the balanced equation CO₂ + Si → SiO₂ + C,if you were to react 1 mole of CO₂ with 1 mole of Si,which statement is TRUE?

Given the chemical equation: 2 Ca + O₂ → 2 CaO, if 2 moles of CaO are formed in this reaction,then 2 moles of O₂ must have reacted.

A sample of 8.5 g NH₃on oxidation produces 4.5 g of NO.Calculate the percent yield. Reaction: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2 Al + 6 HCl → 2 AlCl₃ + 3H₂

How many moles of NH₃ 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)

How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO₃) ₂ and 2.40 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

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.

How many moles of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

The conversion factor for moles of carbon dioxide to mass of carbon dioxide is: 1 mole CO₂ ≡ 44.01 g

How many moles of water are needed to react with 2.2 moles of Li₂O? Given: Li₂O + H₂O → 2 LiOH

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 limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO₂? Reaction: C + SiO₂ → SiC + O₂

How many moles of water are made from complete reaction of 1.4 moles of hydrogen gas? Given the reaction: 2H₂ + O₂ → 2H₂O

Given the reaction: 2 Na(s)+ Cl₂(g)→ 2 NaCl(s) The conversion factor for chlorine gas to sodium metal is: 2 mol Cl ≡ 2 mol Na