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Potassium chlorate decomposes into potassium chloride and oxygen gas.Balance then reaction first!2 KClO3 (s)  → 2 KCl (s)  + 3 O2 (g) If 165 mL of oxygen is produced at 30.0 °C and 90.0 kPa, what mass of KClO3 was decomposed?

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