Chemistry CP
Stoichiometry Quiz #1
Name: _____________________________
1. What does a balanced equation tell you that an unbalanced equation does not? (2 points)
2. Using this balanced equation: 2Na + 2 H2O Æ 2NaOH + H2, complete the following Mole Ratios:
(3 Points)
_______ moles of Na = _______ moles of H2O
_______ moles of Na = _______ moles of H2
_______ moles of Na = _______ moles of NaOH
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_______ moles of H2O = _______ moles of NaOH
_______ moles of H2O = _______ moles of H2
_______ moles of NaOH = _______ moles of H2
3. According to the following balanced equation, 2 Fe + 3Cl2 Æ 2FeCl3, how many moles of
Chlorine (molar mass = 70.906 g/mol) will be needed to produce 10.9 moles of Iron (III)
Chloride (FeCl3 , molar mass = 162.204 g/mol)? (3 Points)
4. According to the following balanced equation, 2 Fe + 3Cl2 Æ 2FeCl3, how many moles of iron
(atomic mass = 55.845 g/mol) will be needed to produce 1.89 moles of Iron (III) Chloride
(FeCl3 , molar mass = 162.204 g/mol)? (3 Points)
5. Using this balanced equation, 2 Mg + O2 Æ 2MgO how many grams of magnesium (Mg atomic
mass = 24.305 g/mol) will be used if 2.14 moles of magnesium oxide (MgO, molar mass = 40.304
g/mol) are reacted? (5 Points)
Chemistry CP
Stoichiometry Quiz #1
Name: _____________________________
6. Using this balanced equation, 2 Mg + O2 Æ 2MgO how many grams of oxygen (O2 molar mass
= 31.998 g/mol) will be used if 3.62 moles of magnesium oxide (MgO, molar mass = 40.304
g/mol) are reacted? (5 Points)
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7. Using this balanced equation, 2BCl3+ 3 H2 Æ 2 B + 6HCl, how many grams of hydrochloric
acid (HCl, Molar mass = 36.4609 g/mol) can be produced from 4.65 grams of Hydrogen gas
(molar mass= 1.0158 g/mol)? (7 Points)
8. Using this balanced equation, 2BCl3+ 3 H2 Æ 2 B + 6HCl, how many grams of hydrochloric
acid (HCl, Molar mass = 36.4609 g/mol) can be produced from 17.6 grams of boron trichloride
(molar mass= 117.17 g/mol)? (7 Points)
Chemistry CP
Stoichiometry Quiz
Name: _____________________________
1. What is a LIMITING REACTANT? (2 points)
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2. According to the following balanced equation, 2 FePO4 + 3 Na2SO4 ÆFe2(SO4)3 + 2 Na3PO4,
how many grams of iron (III) sulfate (Fe2(SO4)3) can be produced from 30 grams of iron (III)
phosphate (FePO4) and 40 grams of sodium sulfate (Na2SO4)? (12 Points)
3. In the above reaction, which substance is the limiting reactant? (1 points)
4. How much excess (IN GRAMS) remains of the non limiting reactant? (3 points)
5. If Dexter performed this experiment in his laboratory and actually obtained 30 grams of
Fe2(SO4)3, what is the percent yield of the reaction? (2 points)
Atomic and Molar Masses You MAY need for the above problems
FePO4: 151 g = 1 mole, Na2SO4: 142 g = 1mole,
Fe2(SO4)3: 400 g = 1 mole, Na3PO4: 164 g = 1 mole
Chemistry CP
Stoichiometry Quiz
Name: _____________________________
6. What is a STOICHIOMETRY? (2 points)
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7. According to the following balanced equation, 2 FePO4 + 3 Na2SO4 ÆFe2(SO4)3 + 2 Na3PO4,
how many grams of sodium phosphate (Na3PO4) can be produced from 25 grams of iron (III)
phosphate (FePO4) and 40 grams of sodium sulfate (Na2SO4)? (12 Points)
8. In the above reaction, which substance is the limiting reactant? (1 points)
9. How much excess (IN GRAMS) remains of the non limiting reactant? (3 points)
10. If Dexter performed this experiment in his laboratory and actually obtained 20 grams of Na3PO4,
what is the percent yield of the reaction? (2 points)
Atomic and Molar Masses You MAY need for the above problems
FePO4: 151 g = 1 mole, Na2SO4: 142 g = 1mole,
Fe2(SO4)3: 400 g = 1 mole, Na3PO4: 164 g = 1 mole