Question

Calcium oxide can be prepared by heating calcium metal in oxygen according to the reaction: 2Ca+ O(2) --> 2CaO. How many grams of calcium would be needed to produce 15.0 grams of calcium oxide?
mols CaO = grams/molar mass.
Convert mols CaO to mols Ca using the coefficients in the balanced equation. Then g Ca = mols a x atomic mass Ca.

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