# Given this equation: N2 + 3 H2 ---> 2 NH3, write the following molar ratios: a) N2 / H2, b) N2 / NH3 and c) H2 / NH3

May 6, 2014

In order to determine the mole ratio, we need to begin with a balanced chemical equation.

For this reaction the balanced chemical equation is
${N}_{2} + 3 {H}_{2} \to 2 N {H}_{3}$

The mole ratios are determined using the coefficients of the substances in the balanced chemical equation.

$1 m o l {n}_{2} : 3 m o l {H}_{2} : 2 m o l N {H}_{3}$

The mole ratios for each substance pair would be

$1 m o l {N}_{2} : 3 m o l {H}_{2}$

$\frac{1 m o l {N}_{2}}{3 m o l {H}_{2}}$ or $\frac{3 m o l {H}_{2}}{1 m o l {N}_{2}}$

$1 m o l {N}_{2} : 2 m o l N {H}_{3}$

$\frac{1 m o l {N}_{2}}{2 m o l N {H}_{3}}$ or $\frac{2 m o l N {H}_{3}}{1 m o l {N}_{2}}$

$3 m o l {H}_{2} : 2 m o l N {H}_{3}$

$\frac{3 m o l {H}_{2}}{2 m o l N {H}_{3}}$ or $\frac{2 m o l N {H}_{3}}{3 m o l {H}_{2}}$