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Solution: A 3.57 g sample of KCl-KClO3  mixture is decomposed by heating and produces 119 mL O2(g), measured at 22.4°C and 738 mm Hg. What is the mass percent of KClO 3 in the mixture assuming that all the KClO3 decomposes according to the following equation. KClO3(s) → KClO(s) + O2(s) a) no given answer is close b) 38.2% c) 16.4% d) 19.1 % e)  32.8%

Problem

A 3.57 g sample of KCl-KClO3  mixture is decomposed by heating and produces 119 mL O2(g), measured at 22.4°C and 738 mm Hg. What is the mass percent of KClO 3 in the mixture assuming that all the KClO3 decomposes according to the following equation.

KClO3(s) → KClO(s) + O2(s)

a) no given answer is close

b) 38.2%

c) 16.4%

d) 19.1 %

e)  32.8%