Question

If a certain gas occupies a volume of 10 L when the applied pressure is 5.0 atm , find the pressure when the gas occupies a volume of 2.5 L .

Answer 1

We assume the change in volume occurs at constant temperature and so we use the Boyle's law formula
`P_1V_1=P_2V_2`.

We are given the initial volume and pressure as well as as final volume, the question wants the final pressure
`P_2`

So we make
`P_2` the subject of the formula

`P_2= (P_1 V_1)/(V_2) = (5*10)/(2.5)= 20 atm`