How do I answer this question? Cant seem to figure out the answer.

Question

For the reaction

3 H₂ (g)   +   N₂ (g)    →   2 NH₃ (g),

how many grams of ammonia will be produced from 2.40 moles of hydrogen gas?

Answer 1

The stoichiometry is (2.40 mol H₂)*(2 mol NH₃ /3 mol H₂)*(17.0g NH₃ /1 mol NH₃) = 27.2g NH₃.