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Potash is composed mainly of potassium carbonate. K2CO3. If 1.000-g of potash reacts with sulfuric acid to produce 145 mL of carbon dioxide gas at STP, what is the percentage of potassium carbonate in the marble sample?

K2CO3(s) + H2SO4(aq)------ K2SO4(aq) + H2O(l)+ C)2(g)

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