N2 + 3H2 --> 2NH3

Question

how many grams of ammonia are made if you have 15.00 g of both N2 and H2 present?

Answer 1

Well, you have to figure the amount of moles of each you have.

molesN2=15/28
molesH2=15/2

so you have molN2=.538
and you must have three times that H3, or 1.61 moles. Well, you have too much H2, so all doesn't react.

moles ammonia you get is then 2*.538, convert that to grams.