Small Amounts of Oxygen Gas Can Be Produced for Laboratory $\rightarrow$

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) $\rightarrow$ _{____}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