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20.0g Ca + 16.0g S = 36.0g CaS

% Composition of Ca = 20.0g Ca/36.0g CaS x 100 = 55.6% Ca

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11y ago
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14y ago

The total mass of the compound is 20.0 + 16.0 = 36.0. The percentage of Ca is the mass of the Ca over the total mass, so it's 20.0/36.0 = 0.556

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Q: If 20.0 grams of Ca combines completely with 16.0 grams of S to form a compound what is the percent composition of Ca in the compound?
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