How many grams of NH3 are produced when 168 grams of N2 react with excess H2?

Question

Balanced form: N2+3H2=2NH3

Answer 1

You will need to convert grams of N₂ to moles of N₂, to moles of NH₃ to grams of NH₃

To do this you need the molar mass of N₂ (28g/mol), the molar mass of NH₃ (17 g/mol), and the balanced chemical equation (this gives you the ratio of moles NH₃ per moles of N₂).

168 g N₂ x 1 mol N₂ x 2 mol NH₃ x 17 g NH₃ = 204 g NH₃

28 g N₂ 1 mol N₂ 1 mol NH₃