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 Form 3 Chemistry Questions and Answers on The Mole

The empirical formula of lead (II) oxide was determined by passing excess dry hydrogen gas over 6.69 g of heated lead (II) oxide.
a).What was the purpose of using excess dry hydrogen gas?
b).The mass of the lead was found to be 6.21 g. Determine the empirical formula of the oxide. (Pb = 207.0 ; O = 16.0).
(KCSE 2017 paper 1 question 4)

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