Calculate the mass of ammonia formed from 5 moles of nitrogen.

1. We compose the reaction equation:

N2 + 3 H2 = 2 NH3

According to the equation:

1 mol of N2 enters into the reaction;
the reaction gives 2 mol of NH3.
Let’s find the mass of ammonia by the formula:

m (NH3) = n * M = 2 mol * (14 + 1 * 3) = 2 * 17 = 34 g

2. Let’s calculate the mass of ammonia, making up the proportion:

5 mol N2 – x g NH3

1 mol N2 – 34 g NH3

Hence, x = 5 * 34/1 = 170 g.