Hydrogen gas reactions with nitrogen to form ammonia according to the following chemical equation:

H2(g) + N2(g) --> NH3(g)

How many grams of H2 are needed to produce 12.15 grams of NH3? (express your answer as numeric only with 3 significant digits)

1 answer

First, balance the equation.
3H2(g) + N2(g) → 2NH3(g)
how many moles of NH3 in 12.15 g?
You will need 3/2 that many moles of H2. Convert that to grams.