# A container has a volume of #3 L# and holds #16 mol# of gas. If the container is expanded such that its new volume is #5 L#, how many moles of gas must be injected into the container to maintain a constant temperature and pressure?

##### 1 Answer

Mar 11, 2018

I get

#### Explanation:

At a constant temperature and pressure, we can use Avogadro's law, which states that

or

where

Rearranging for

Plugging in the given values, we get

Since this is the new volume, and the question asks **"how many moles should be injected"**, we need to subtract the new amount from the old amount, i.e. find

We got: