# A container has a volume of #3 L# and holds #7 mol# of gas. If the container is expanded such that its new volume is #15 L#, how many moles of gas must be injected into the container to maintain a constant temperature and pressure?

##### 1 Answer

Jul 17, 2018

28 mol

#### Explanation:

P is pressure

V is volume

n is mol

R is the universal gas constant

T is temperature.

1st situation:

2nd situation

P is the same in the 1st and 2nd situations. R and T are the same also (n is the moles in the second situation).