# If #7/5# #L# of a gas at room temperature exerts a pressure of #3# #kPa# on its container, what pressure will the gas exert if the container's volume changes to #5/3# #L#?

##### 1 Answer

Feb 19, 2016

#### Answer:

Start with the Combined Gas Law:

Temperature is constant, so

#### Explanation:

We could memorise Boyle's, Charles' and Gay-Lussac's Laws, which relate various combinations of pressure, volume and temperature, but I find it simpler to just memorise the Combined Gas Law and then eliminate the thing that is kept constant.

In this case, the temperature is kept constant, so we can ignore it:

Rearranging: