# A container has a volume of #21 L# and holds #27 mol# of gas. If the container is compressed such that its new volume is #18 L#, how many moles of gas must be released from the container to maintain a constant temperature and pressure?

##### 1 Answer

Sep 24, 2016

#### Explanation:

Let's use Avogadro's law:

The number 1 represents the initial conditions and the number 2 represents the final conditions.

• Identify your known and unknown variables:

• Rearrange the equation to solve for the final number of moles:

• Plug in your given values to obtain the final number of moles: