Question

Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO3(s). The...

Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO3(s). The equation for the reaction is

2KclO3 ----> 2KCl+3O2

calculate how many grams of O2(g) can be produced from heating 26.3 grams of KClO3 (S)

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Answer #1

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

245 g                                                    96 g

26.3 g                                                     ???

245 g KClO3 ---------------------> 96 g O2

26.3 g KClO3 -----------------------> x g O2

x = 26.3 x 96 / 245

x = 10.3 g

mass of O2 produced = 10.3 g

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