Question

Nitrogen and hydrogen gas react to form ammonia gas. At a certain temperature and pressure 1.2 L of N2 reacts with 3.6 L of H2. If all of both gases are consumed what is the final volume of NH3 produced?

Answer 1

The final volume is `2.4" L"`

Explanation:

Here is the balanced equation

`N_2+3H_2= 2NH_3`

At STP, 1 mole has a volume of 22.4 Liters. To do a dimensional analysis conversion from Liters to moles:

`(N" Liters")/1(1" mole")/(22.4" Liters") = N/22.4" moles"`

Please observe that Liters and moles vary directly, therefore, we can simply multiply each of the coefficients (that represent moles) by `1.2" L"` to obtain the volumes:

`(1.2" L")N_2+(3.6" L")H_2= (2.4" L")NH_3`

It does not really matter what number of moles that we have as long as we maintain the `1:3:2` relationship.