Small Amounts of Oxygen Gas Can Be Produced for Laboratory

question 129

Multiple Choice

Small amounts of oxygen gas can be produced for laboratory use by heating potassium chlorate, which causes it to decompose by the following reaction: ___KClO₃(s) → ____KCl(s) + ___O₂(g) (unbalanced) Balance the equation, and determine the mass of oxygen that should be formed if 10.0 g of potassium chlorate decomposes.

• A)7.83 g
• B)115 g
• C)3.92 g
• D)38.3 g
• E)57.4 g

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