Question

If 4 moles of gas are added to a container that already holds 1 mole of gas, what happens to the pressure inside the container due to the change in the amount of gas?

Answer 1

The pressure increases fivefold.

Explanation:

At constant volume, and constant temperature, pressure is proportional to the number of molecules, and thus to the number of moles.

We can see this immediately from the Ideal Gas equation:

i.e. `P_1` `=` `(nxxRxxT)/V`

`P_2` `=` `((n+4n)xxRxxT)/V` `=` `5P_1`