Question

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

Answer 1

`"3 H"_2": 2 NH"_3"`

Explanation:

`"N"_2 + "3H"_2` `rarr` `"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 `"3 H"_2:"2 NH"_3"`. When using the mole ratio with stoichiometry questions, you should write the mole ratio as follows:

`(3"mol H"_2)/(2"mol NH"_3)` or `(2"mol NH"_3)/(3"mol H"_2)`

Answer 2

3:2

Explanation:

The ‘Moles” are the coefficients of the molecules in the reaction equation. In this equation the coefficient of hydrogen is ‘3’ and the coefficient of ammonia is ‘2’.

So, the ratio of hydrogen to ammonia is 3:2.