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**Stoichiometry Practice Problems:**

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**Practice Problem #1:**

Oxygen gas can be produced
by decomposing potassium chlorate using the reaction below. If 138.6 g of KClO_{3}
is heated and decomposes completely, what mass of oxygen gas is produced?

KClO_{3} (s)
--> KCl (s) + O_{2}
(g) [unbalanced]

**Practice Problem #2:**

Identify the limiting
reagent for the given combination of reactants. Calculate how many grams of
whatever substance will be in excess and how many grams of HF will be made.

F_{2} (g)
+ NH_{3} (g)
--> N_{2}F_{4}
(g) +
HF (g) [unbalanced]

5.33 mol 2.22 mol

**Practice Problem #3:**

How many grams of
aluminum sulfate are produced if 23.33 g Al reacts with 74.44 g CuSO_{4}?

Al (s) + CuSO_{4} (aq) --> Al_{2}(SO_{4})_{3}
(aq) +
Cu (s) [unbalanced]

**Practice Problem #4:**

Given the following
reaction, answer Parts A and B.

NaClO_{3} (s) -->
NaCl (s) + O_{2}
(g) [unbalanced]

Part A:
12.00 moles of NaClO_{3} will produce how many grams of O_{2}?

Part B: How
many grams of NaCl are produced when 80.0 grams of O_{2} are produced?