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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 potash sample? K2CO3(s) + H2SO4(aq) > K2SO4(aq) + H2O(l) + CO2(g)

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