Question

CuO
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Answer 1

w = n * Ar/Mr * 100%;

Ar(Cu) = 64;

Ar(O) = 16;

Mr(CuO) = 64 + 16 = 80;

w(Cu) = 64 / 80 * 100% = 80%

w(O) = 16 / 80 * 100% = 20%