Question 1

The percent yield is calculated by dividing the actual yield by the theoretical yield times 100.

Accepted Answer

A) True 
 B)False

Question 2

The conversion factor between mass and moles for a compound is the molar mass.

Accepted Answer

A) True 
 B)False

Question 3

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 4

The reaction for the oxidation of NH3 is given as: 4 NH3 + 5 O2 → 4 NO + 6 H2O
Under certain conditions the reaction will proceed at 29.8% yield of NO.How many grams of NH3 must be made to react with excess oxygen to yield 70.5 g of NO?

Accepted Answer

A)  134
B)  237
C)  21.0
D)  2.37
E)  none of the above

Question 5

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 6

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 7

The limiting reactant is not necessarily the reactant with the least mass.

Accepted Answer

A) True 
 B)False

Question 8

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

Question 9

What is the excess reactant 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)  Ca(OH) 2
B)  HCl
C)  H2O
D)  CaCl2
E)  not enough information

Question 10

Consider the reaction: 2 Al + 3Br2 → 2 AlBr3 Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br2.What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

Accepted Answer

A)  1.0 mole Al; 0 mole Br2; 4.0 mole AlBr3
B)  0 mole Al; 0 mole Br2; 11.0 mole AlBr3
C)  2.0 mole Al; 3.0 mole Br2; 2.0 mole AlBr3
D)  0 mole Al; 1.0 mole Br2; 4.0 mole AlBr3
E)  none of the above

Question 11

How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? 
Given the reaction: 2H2 + O2 → 2H2O

Accepted Answer

A)  18
B)  72
C)  36
D)  4.5
E)  not enough information

Question 12

The limiting reactant is the product that is completely consumed in a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 13

What is the limiting 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

Question 14

Given the reaction: 2 Na(s)+ Cl2(g)→ 2 NaCl(s)
The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl2 ≡ 2 mol NaCl

Accepted Answer

A) True 
 B)False

Question 15

Which ingredient is the limiting reactant if you have 6 cups of flour,9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

A)  flour
B)  eggs
C)  oil
D)  waffles
E)  not enough information

Question 16

What is the percent yield of CuS for the following reaction given that you start with 2S and   CuSO4?  The actual amount of CuS produced was   . Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) 16.1% B) 42.1% C) 18.93% D) 7.25% E) not enough information" class="answers-bank-image d-inline" rel="preload" > of Na2S and 2S and   CuSO4?  The actual amount of CuS produced was   . Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) 16.1% B) 42.1% C) 18.93% D) 7.25% E) not enough information" class="answers-bank-image d-inline" rel="preload" > CuSO4? 
The actual amount of CuS produced was 2S and   CuSO4?  The actual amount of CuS produced was   . Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) 16.1% B) 42.1% C) 18.93% D) 7.25% E) not enough information" class="answers-bank-image d-inline" rel="preload" > . Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Accepted Answer

A)  16.1%
B)  42.1%
C)  18.93%
D)  7.25%
E)  not enough information

Question 17

How many moles of lithium nitrate are theoretically produced if we start with 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)  7.2
B)  6.8
C)  1.2
D)  1.1
E)  not enough information

Question 18

Consider a reaction of chemicals depicted as A + B → C + D.Suppose reaction of 17.8 grams of A with 29.5 grams of B gave 24.7 grams of C.However,the theoretical yield of C for this reaction was 33.3 grams.What was the percent yield of chemical C?

Accepted Answer

A)  74.2
B)  47.3
C)  11.7
D)  135
E)  none of the above

Question 19

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins
If you have 9 cups of flour,4 eggs and plenty of blueberries,the theoretical yield of muffins is 16.

Accepted Answer

A) True 
 B)False

Question 20

The limiting reactant determines what the actual yield is.

Accepted Answer

A) True 
 B)False

Exam 8: Quantities in Chemical Reactions

What is the limiting 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

Correct AnswerverifiedShow Answer

The limiting reactant determines what the actual yield is.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO3) 2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3) 2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4) 2

Correct AnswerverifiedShow Answer

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins If you have 9 cups of flour,4 eggs and plenty of blueberries,the theoretical yield of muffins is 16.

Correct AnswerverifiedShow Answer

Consider a reaction of chemicals depicted as A + B → C + D.Suppose reaction of 17.8 grams of A with 29.5 grams of B gave 24.7 grams of C.However,the theoretical yield of C for this reaction was 33.3 grams.What was the percent yield of chemical C?

Correct AnswerverifiedShow Answer

The conversion factor between mass and moles for a compound is the molar mass.

Correct AnswerverifiedShow Answer

Consider the reaction: 2 Al + 3Br2 → 2 AlBr3 Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br2.What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

Correct AnswerverifiedShow Answer

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

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The reaction for the oxidation of NH3 is given as: 4 NH3 + 5 O2 → 4 NO + 6 H2O Under certain conditions the reaction will proceed at 29.8% yield of NO.How many grams of NH3 must be made to react with excess oxygen to yield 70.5 g of NO?

Correct AnswerverifiedShow Answer

What is the excess reactant 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

Correct AnswerverifiedShow Answer

The percent yield is calculated by dividing the actual yield by the theoretical yield times 100.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Given the reaction: 2 Na(s)+ Cl2(g)→ 2 NaCl(s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl2 ≡ 2 mol NaCl

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The limiting reactant is not necessarily the reactant with the least mass.

Correct AnswerverifiedShow Answer

What is the percent yield of CuS for the following reaction given that you start with of Na2S and CuSO4? The actual amount of CuS produced was . Reaction: Na2S + CuSO4 → Na2SO4 + CuS

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The limiting reactant is the product that is completely consumed in a chemical reaction.

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Which ingredient is the limiting reactant if you have 6 cups of flour,9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

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How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? Given the reaction: 2H2 + O2 → 2H2O

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

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

Correct Answer
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How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO₃) ₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Consider the reaction: 2 Al + 3Br₂ → 2 AlBr₃ Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br₂.What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

Correct Answer
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Correct Answer
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The reaction for the oxidation of NH₃ is given as: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O Under certain conditions the reaction will proceed at 29.8% yield of NO.How many grams of NH₃must be made to react with excess oxygen to yield 70.5 g of NO?

Correct Answer
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What is the excess reactant 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

Correct Answer
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Correct Answer
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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

Correct Answer
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Given the reaction: 2 Na(s)+ Cl₂(g)→ 2 NaCl(s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl₂≡ 2 mol NaCl

Correct Answer
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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

Correct Answer
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Correct Answer
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What is the percent yield of CuS for the following reaction given that you start with of Na₂S and CuSO₄? The actual amount of CuS produced was . Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

Correct Answer
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Correct Answer
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Correct Answer
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How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? Given the reaction: 2H₂ + O₂ → 2H₂O

Correct Answer
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