A sample of hydrogen gas has a volume of 4.4 L at a pressure of 800. torr. If the pressure decreases to 400. torr, what will the new volume be?

Answer 1

Assuming the temperature is constant, we can use Boyle's Law ... P1V1 = P2V2

P1 = initial pressure = 800. torr

V1 = initial volume = 4.4 L

P2 = final pressure = 400. torr

V2 = final volume = ?

(800 torr)(4.4 L) = (400 torr)(V2 L)

V2 = 8.8 L

(Note: the pressure was cut in half and the volume doubled)