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Question

Use the following balanced equation to answer parts below:

3H₂ + N₂ —> 2NH₃

Part 1-

How many grams of NH₃ can be made from 5.10 mol of H₂ and excess N₂?

___ g NH₃

Part 2-

How many grams of NH₃ can be made from 1.90 mol of N₂ and excess H₂?

___ g NH₃

Part 3-

If you want to make 23.52 mol of NH₃, how many grams of N₂ do you need?

____ g N₂

Answer 1

3H₂ + N₂ —> 2NH₃

Using dimensional analysis:

Part 1. 5.10 mol H₂ x 2 mol NH₃/3 mol H₂ x 17 g NH₃/mol NH₃ = 57.8 g NH₃

Part 2. 1.90 mol N₂ x 2 mol NH₃/mol N₂ x 17 g NH₃/mol NH₃ = 64.6 g NH₃

Part 3. 23.52 mol NH₃ x 1 mol N₂/2 mol NH₃ x 28 g N₂/mol N2 = 329 g N₂