Question

N2 + H2 -> NH3
How many moles of H2 gas are used to make 36.5 grams of NH3?

Answer 1

Step-by-step explanation:

First, you need to balance the equation:

N2 + 3 H2 ====> 2 NH3

so three moles of H2 result in 2 moles of NH3

ratio of 3:2

How many moles of NH3 is 36.5 gm ??

Using periodic table NH3 mole weight = 14.007 + 3*1.008 =17.031 g/mole

36.5 g / 17.031 g/mole = 2.14 moles of NH3

Using the ratios above 3/2 = x / 2.14 shows x = 3.21 moles of H2 needed