Question

How many moles of Hydrogen gas must be used to make 0.75 mol of NH3?
N2+3H2 --->2NH3 *

Answer 1

1.125 moles of hydrogen are needed.

Step-by-step explanation:

Given data:

Number of moles of ammonia formed = 0.75 mol

Number of moles of hydrogen needed = ?

Solution:

Chemical equation:

N₂ + 3H₂ → 2NH₃

Now we will compare the moles of ammonia and hydrogen.

NH₃ : H₂

2 : 3

0.75 : 3/2×0.75 = 1.125 mol

1.125 moles of hydrogen are needed.