How many moles of water are produced when 240 grams of CuO react? Molar mass of CuO = 79.55 g

Question

1.0 mol

54 mol

18 mol

3.0 mol

Answer 1

If we're reacting the CuO with hydrogen gas, then CuO + H₂ --> Cu + H₂O and all mole ratios are 1:1. Then (240g CuO) (1 mole CuO /79.55g CuO) = 3.0 mole CuO = 3.0 mole H₂O.