Question 189916
For this chemistry problem you want to use the equation P1V1 = P2V2 where:


P1 = Initial Pressure
V1 = Initial Volume
P2 = Changed Pressure
V2 = Changed Volume


We're given values for everything but V2 so let's plug in the other values:


4 atm * 7.5 liters = 6.5 atm * V2

30 atm/liter = 6.5atm * V2



Divide both sides by 6.5 atm:

30 atm/liter / 6.5 atm = V2
4.615 ~ V2


So the answer is a. The volume would decrease to about 4.6 liters.

:)