Oxygen may be produced from KClO3 according to the reaction 2KClO3(s) 2 KCl(s) + 3O2(g). A sample of KClO3 was reacted and the gas collected over water. The final volume of the gas was 705 mL and the pressure was 1.104 atm at 20°C. The vapour pressure at 20°C is 17.54 mmHg. What is the mass of the initial sample of KClO3?
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