If 32.00 g of oxygen react, how many grams of water will form according to the unbalanced equation H2 + O2 -> H2O?

Answer 1

2H2 + O2 → 2H2O (balanced)

32 g O2 x (1 mole O2/32 g O2) x (2H2O/1O2) = 2 mole H2O form

Assumes H2 in excess.