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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
d) 19.1 %