Question

For 1.666 g of a compound containing only copper and oxygen, CuxOy, a student found that it contained 1.19 g Cu. How many moles of Cu are there in the sample? Answer with 4 Sig Figs and a unit of 'mol' to ensure full credit.

Answer 1

Cu is about 63.546 grams / mol
1.19 grams of copper * 1mol / 63.546 grams = 0.01873 mols