Question

If 78. 2 grams of oxygen (O2) react with plenty of copper Cu, how many moles of

copper (II) oxide (CuO) will be produced?

Answer 1

The molar mass of oxygen is 32 g. Hence the number of moles of oxygen are: 78.2 g / (32 g/mole) = 78.2/32 moles Since 1 mole of oxygen produces 2 moles of copper oxide, the number of moles of copper oxide generated are: (78.2/32) x 2 moles = 4.89 moles of copper oxide.

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