2Cu + O2 = 2CuO.
Let’s determine the molar mass of copper and copper oxide.
M (Cu) = 64 g / mol.
M (CuO) = 80 g / mol.
Let’s determine the mass of copper according to the reaction equation.
X g of copper – 80 g of copper oxide.
2 * 64 g / mol – 2 * 80 g / mol.
X = 2 * 64 * 80 / (2 * 80) = 64 g.
Answer: the mass of copper is 64 g.
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