20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (At.Wt.of Mg =24)

Options

(a) 96
(b) 60
(c) 84
(d) 75

Correct Answer:

84

Explanation:

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