Chemistry

(1) What is the percentage oxygen in 4grams of caco3.

(2) What mass of Oxygen is require to react completely with 16grams of hydrogen.

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1. (1) %O in CaCO3 = (3*atomic mass O/molar mass CaCO3)*100 = ?? and that is the same answer for 4 grams CaCO3 or 1000 g CaCO3.

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