A sample of kclo3 on decomposition yielded 448 ml of oxygen gas at stp . Then the weight of kclo3 originally taken was
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given, volume of oxygen gas = 448 ml at STP
so, number of mole oxygen gas at STP = 448/22400 = 2/100 = 0.02mol
KClO3 decomposes into potassium chloride and oxygen
i.e.,
it is clear that 2 moles of KClO3 yielded 3 moles of Oxygen.
or, 1 mole of oxygen is yielded by 2/3 mol of KClO3
or, 0.02mol of oxygen is yielded by 2/3 × 0.02 = 0.04/3 mol of KClO3 .
so the weight of KClO3 = mole of KClO3 × molar mass of KClO3
= 0.04/3 × (122.55 g/mol) [ molar mass of KClO3 = 122.55]
= 1.634g
hence, weight of KClO3 originally taken was was 1.634g
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