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