# Chapter 18 - Reaction Rates and Equilibrium - 18 Assessment - Page 642: 121

2 KClO3 -> 2 KCl + 3 O2 1.91 g O2

#### Work Step by Step

First, write the unbalanced chemical equation with the correct chemical formulas and states. First, balance the oxygen atoms with coefficients of 2 for potassium chlorate and 3 for oxygen gas. This gives 6 oxygen atoms on both sides of the equation. Then balance the potassium and chlorine atoms with a coefficient of 2 for potassium chloride. The equation is now balanced. Use the molar mass of potassium chlorate, followed by a mole ratio, then followed by the molar mass of oxygen in order to find the number of grams of oxygen produced.

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