What is the mass percent composition of calcium in calcium oxide? THANK YOU?

Question

Roger the Mole · Accepted Answer

Molar mass of Ca is 40.0780 g/mol
Molar mass of CaO is 56.0774 g/mol
(40.0780 g/mol) / (56.0774 g/mol) = 0.71469 = 71.469% Ca by mass

Sheldon · Answer

calcium oxide= CaO
% Ca: molar mass Ca/molar mass CaO x 100
% O: molar mass O/molar mass CaO x 100

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