Question

How many grams of nitrogen are required to react with 2.79 grams of hydrogen to form ammonia?

Answer 1

Molar mass:

H2 = 2 g/mol
N2 = 28 g/mol

Mole ratio:

3 H2 + N2 = 2 NH3

3 x 2 g H2 ---------- 28 g N2
2.79 g H2 ---------- ??

2.79 x 28 / 3 x 2 =

78.12 / 6 => 13.02 g of N2