Stoichiometry Review OL Chemistry Question Preview (ID: 55240)


Mol-mol, Gram-gram, Mol-gram, Limiting Reactant, % Yield. TEACHERS: click here for quick copy question ID numbers.

2Mg + O2 = 2MgO. How many mol of O2 are needed to produce 12 mol of magnesium oxide?
a) 6.0 mol O2
b) 24 mol O2
c) 12 mol O2
d) 3.0 mol O2

Ca + O2 = CaO. How many grams of calcium would be needed to make 15.0g of CaO?
a) 9.7 g Ca
b) 10.7 g Ca
c) 11.8 g Ca
d) 5.6 g Ca

KClO3 = KCl + O2. How many moles of O2 are produced from 30.5 grams of KClO3?
a) 0.964 mol O2
b) 14 .1 mol O2
c) 11.9 mol O2
d) 0.373 mol O2

Zn + HCl = ZnCl2 + H2. What is the mass of HCl needed to react with 5.0 moles of Zn?
a) 180 g HCl
b) 5.0 g HCl
c) 360 g HCl
d) 92 g HCl

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) 1.001 g Cu
d) 12.99 g Cu

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) 89.7% H2O
b) 102% H2O
c) 78.9% H2O
d) 98.2% H2O

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) 13.2 g P4O6
b) 10.2 g P4O6
c) 4.47 g P4O6
d) 20.4 g P4O6

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) P4O6
b) P4
c) O2
d) Not enough information

NaCl + H2SO4 = Na2SO4 + HCl. How many grams of HCl are produced when 15.0 grams of sodium chloride reacts with H2SO4?
a) 1.033 g HCl
b) 9.36 g HCl
c) 8.22 g HCl
d) 13 g HCl

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) 88.74% Na2SO4
b) 125.2% Na2SO4
c) 50.12% Na2SO4
d) 79.83% Na2SO4

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