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Stoichiometry Review OL Chemistry
Test Description: Mol-mol, gram-gram, mol-gram, limiting reactant, % yield
Instructions: Answer all questions to get your test result.
1) 2Mg + O2 = 2MgO. How many mol of O2 are needed to produce 12 mol of magnesium oxide?
A
3.0 mol O2
B
24 mol O2
C
6.0 mol O2
D
12 mol O2
2) Ca + O2 = CaO. How many grams of calcium would be needed to make 15.0g of CaO?
A
5.6 g Ca
B
9.7 g Ca
C
10.7 g Ca
D
11.8 g Ca
3) KClO3 = KCl + O2. How many moles of O2 are produced from 30.5 grams of KClO3?
A
11.9 mol O2
B
0.373 mol O2
C
0.964 mol O2
D
14 .1 mol O2
4) Zn + HCl = ZnCl2 + H2. What is the mass of HCl needed to react with 5.0 moles of Zn?
A
180 g HCl
B
360 g HCl
C
5.0 g HCl
D
92 g HCl
5) Cu + AgNO3 = Cu(NO3)2 + Ag. What is the mass of Cu needed to react with 12.0 g of AgNO3?
A
2.24 g Cu
B
13.01 g Cu
C
12.99 g Cu
D
1.001 g Cu
6) H2 + O2 = H2O. Theoretically, a reaction should produce 82.7 g of water, but if the reaction produces 81.2 g of water in the lab, what is the percent yield?
A
78.9% H2O
B
98.2% H2O
C
102% H2O
D
89.7% H2O
7) P4 + 3 O2 = P4O6. A reaction container holds 5.77 g of P4 and 5.77 g of O2. What theoretical yield, in grams, of P4O6 can be produced?
A
4.47 g P4O6
B
10.2 g P4O6
C
13.2 g P4O6
D
20.4 g P4O6
8) P4 + 3 O2 = P4O6. A reaction container holds 5.77 g of P4 and 5.77 g of O2. What is the limiting reactant?
A
P4
B
P4O6
C
O2
D
Not enough information
9) NaCl + H2SO4 = Na2SO4 + HCl. How many grams of HCl are produced when 15.0 grams of sodium chloride reacts with H2SO4?
A
13 g HCl
B
9.36 g HCl
C
1.033 g HCl
D
8.22 g HCl
10) NaOH + H2SO4 = Na2SO4 + H2O. Experimentally, you obtained 37.45 g of sodium sulfate , but theoretically should have obtained 46.91 g of sodium sulfate. What is the percent yield?
A
125.2% Na2SO4
B
88.74% Na2SO4
C
79.83% Na2SO4
D
50.12% Na2SO4
*select an answer for all questions
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