Calculate the mass of NH3 produced by the reaction of 56 g of N2 with H2

Question

NH₃

N₂

H₂

Answer 1

Set up your reaction equation and balance it:

_N₂ + _H₂ => _NH₃, and you would find the coefficients to be as follows (in order): 1, 3, 2.

Then, consult the periodic table to find the molecular masses of these elements: Nitrogen (~14 g/mol) and Hydrogen (~1 g/mol).

Since you have 56g of N₂ to start with, you have to look at your molar ratio of N₂ to NH₃, which gives you a 1:2 ratio. This is important for the following dimensional analysis:

56g N₂ * (1 mol N₂/ 28g N₂) * (2 mol NH₃/1 mol N₂) * (17g NH₃/1 mol NH₃) = 68g NH₃ produced.