A container has a volume of #3 L# and holds #2 mol# of gas. If the container is expanded such that its new volume is #12 L#, how many moles of gas must be injected into the container to maintain a constant temperature and pressure?

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Answer 1 · 2016-08-18T11:59:02

P times V equals n times R times T

Since P (pressure) and T (temperature in Kelvin) will be the same:
and R is constant

In the second situation, you expand (volume) 4 times (#(12 L)/(3 L)=4#). The original mol was 2 and now you will need total 8 mol of gas.

Now you need to inject #8-2 = 6# mol gas into your contained under new situation.