Question

A container has a volume of `18 L` and holds `15 mol` of gas. If the container is expanded such that its new volume is `24 L`, how many moles of gas must be injected into the container to maintain a constant temperature and pressure?

Answer 1

The number of moles to be injected is `=5 mol`

Explanation:

We apply Avogadro's Law

`V_1/n_1=V_2/n_2`

Initial volume is `V_1=18L`

Initial number of moles `n_1=15mol`

Final volume is `V_2=24L`

Final number of moles is

`n_2=V_2/V_1*n_1`

`=24/18*15`

`=20mol`

Number of moles to be injected is `=n_2-n_1=20-15=5mol`