# What is the mole ratio between hydrogen ("H"_2") and ammonia ("NH"_3") in the chemical equation "N"_2 + "3H"_2rarr"2NH"_3"?

Apr 7, 2017

$\text{3 H"_2": 2 NH"_3}$

#### Explanation:

${\text{N"_2 + "3H}}_{2}$$\rightarrow$$\text{2NH"_3}$

In a balanced equation, the coefficients are the number of moles of each substance. If no coefficient is written, then it is understood to be $1$.

There are 3 moles hydrogen gas and 2 moles ammonia in the balanced chemical equation. The mole ratio of the two substances is $\text{3 H"_2:"2 NH"_3}$. When using the mole ratio with stoichiometry questions, you should write the mole ratio as follows:

$\left(3 {\text{mol H"_2)/(2"mol NH}}_{3}\right)$ or $\left(2 {\text{mol NH"_3)/(3"mol H}}_{2}\right)$

Apr 7, 2017