Mr(CuO) = 80;
ω(Cu) = N(Cu) * Ar(Cu) * 100% / Mr(CuO) = 1 * 64 * 100% / 80 = 80%.
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Mr(CuO) = 80;
ω(Cu) = N(Cu) * Ar(Cu) * 100% / Mr(CuO) = 1 * 64 * 100% / 80 = 80%.