Question

Assume that 5.6 L H2 at STP reacts with excess CuO according to the following equation:

CuO + H2 ---> Cu + H2O

How many moles of H2 react?

a. 0.50 mol b. 0.250 mol

c. 0.250 g d. 0.50 g

Answer 1

5.6L = 5600g

According to avagadro, 1 mole of gas = 22.4L

$(5.6/22.4)× 1 =$ 0.25moles