Calculate the mass of copper oxide CuO obtained by reacting 6.4 g of copper with oxygen

Let’s compose the equation for the reaction of the interaction of copper with oxygen:
2Cu + O2 = 2CuO;

The molecular weight of copper is 64 g / mol. Let’s find the amount of substance in copper:
6.4 / 64 = 0.1 mol;

Let’s find the molecular weight of copper oxide:
64 + 16 = 80 g / mol;

Copper oxide has the same coefficient as before copper. This means that the amount of substance in copper oxide is 0.1 mol. Find the mass of copper oxide:
80 * 0.1 = 8 grams;

Answer: The mass of copper oxide is 8 grams.

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