Answer to Question #328956 in Chemistry for Njay

Question

The following equation is 2H2 + O2---2H2O

If 5.0 grams of H2 reacts completely with O2, how many grams of H2O will be produced?

Answer 1

2H₂ + O₂ = 2H₂O

According to the equation, n (H₂O) = n (H₂).

n = m / M

M (H₂O) = 18 g/mol

M (H₂) = 2 g/mol

n (H2) = 5.0 / 2 = 2.5 mol

n (H₂O) = n (H₂) = 2.5 mol

m (H₂O) = n x M = 2.5 x 18 = 45 g