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4 June, 11:25

3. Calculate the mass of oxygen produced from the decomposition of 75.0 g of potassium chlorate.

2KClO3 (s)  2KCl (s) + 3O2 (g)

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  1. 4 June, 13:13
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    29.3 grams

    Explanation:

    2KClO3 - > 2 KCl + 3O2

    Moles of KClO3=75. g/123 g/mol=0.610 mol

    Moles of O2 = 0.610 mol * 3/2=0.915 mol

    Mass of oxygen = 0.915 mol x 32 g/mol=29.3 g
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