Stoichiometry Worksheet #1
A balanced equation reveals mole ratios, which can be converted, as needed, into information in grams (or L or
particles or kJ…), and used to solve stoichiometry problems.
Solve the following. Remember to write a balanced equation as part of your work, if it is not already provided .
1.
In the equation 2 KClO3  2 KCl + 3 O2, how many moles of oxygen are produced when
3.0 mol of KClO3 decompose completely? (A: 4.5 mol O2)
Answer: _____________
2.
The Haber process for the production of ammonia is represented by the unbalanced equation
N2(g) + H2(g)  2 NH3(g). The complete conversion of 9.0 mol of hydrogen to ammonia
would require how many moles of N2? (A: 3.0 mol N2)
Balanced Equation:
Answer: ____________
3.
How many moles of hydrogen gas are needed to react with 15.1 g of chlorine gas to produce
hydrogen chloride gas? (A: 0.213 mol H2)
Balanced Equation:
Answer: _____________
4.
How many moles of calcium oxide are produced when 36.5 g of calcium react completely with oxygen
gas? (0.911 mol CaO)
Balanced Equation:
Answer: _____________
5.
How many grams of oxygen gas are needed to react completely with 16.2 g of hydrogen gas, to
produce water? (A: 128 g O2)
Balanced Equation:
Answer: _____________
6.
How many grams of aluminum are required to produce 415 g of aluminum oxide, through reaction with
oxygen gas? (A: 220. g Al)
Balanced Equation:
Answer: _____________
7.
How many grams of solid iodine are produced by the decomposition of 25.4 g of hydrogen iodide gas?
(A: 25.2 g I2)
Balanced Equation:
Answer: _____________
8.
How many atoms of aluminum will react completely with 1.33 x 1024 atoms of sulfur to produce
aluminum sulfide? (A: 8.87 x 1023 Al atoms)
Balanced Equation:
Answer: _____________
9.
What volume, at STP, of fluorine gas could be produced by the decomposition of 9.22 x 1024 molecules
of POF3? (A: 515 L F2)
Balanced Equation: 4 POF3(g)  P4(s) + 2 O2(g) + 6 F2(g)
Answer: _____________
10.
For the single replacement reaction between zinc and hydrochloric acid, what volume of hydrogen gas
(H2) at STP will be produced if 132 g of Zn reacts completely with an excess of hydrochloric acid?
(A: 45.2 L H2)
Balanced Equation:
Answer: _____________
11.
For the reaction between hydrogen and bromine which produces hydrogen bromide, how many grams of
hydrogen bromide (HBr) will be formed if 5.6 L of hydrogen gas (H2) reacts completely with bromine
(Br2)? (A: 40. g HBr)
Balanced Equation:
Answer: _____________