Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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 3

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 4

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 5

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

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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 8

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 9

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 10

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 11

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 12

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

Accepted Answer

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

Question 13

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 14

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 15

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 16

The limiting reactant determines what the actual yield is.

Accepted Answer

A) True 
 B)False

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

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 19

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

Accepted Answer

A) True 
 B)False

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

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

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

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

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?

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

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

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

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?

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?

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

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

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

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 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.

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

The limiting reactant determines what the actual yield is.

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

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

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

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

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

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

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

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?

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

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

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

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?

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?

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

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

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

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 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.

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

The limiting reactant determines what the actual yield is.

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

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

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

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

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

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?

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?

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

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

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

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

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

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

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

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