reaction stoichiometry

Question

The substances nitrogen monoxide and hydrogen gas react to form nitrogen gas and water.

1. Unbalanced equation:  NO (g) + H₂ (g) N₂ (g) + H₂O (l)

In one reaction, 64.4 g of H₂O is produced. What amount (in mol) of H₂ was consumed? What mass (in grams) of N₂ is produced?

BLANK mol H2 consumed

BLANK g N2 produced

Answer 1

Let us first balance the equation. You MUST have a correctly balanced equation before proceeding.

2NO(g) + 2H₂(g) ==>N₂(g) + 2H₂O(l) ... balanced equation

To find moles H₂ consumed, we will use the stoichiometry of the balanced equation and the 64.4 g H₂O produced. We will apply dimensional analysis as follows:

64.4 g H₂O x 1 mol H₂O/18 g x 2 mol H₂ / 2 mol H₂O = 3.58 moles H₂ consumed

Mass of N₂ produced = 64.4 g H₂O x 1 mol H₂O/18 g x 1 mol N₂/2 mol H₂O x 28 g N₂/mol = 50.1 g N₂