Question

A sample of carbon dioxide occupies a volume of 825 mL at 1.57 atm. What volume would the gas occupy if the pressure was decreased to 0.86 atm?

Answer 1

initial volume(V1)=250 ml
initial pressure(P1)=825 torr
final volume(V2)=400ml
final pressure(P2)=?
At constant temperature,
PV=constant
i.e.
P1V1=P2V2
or, 825×250=P2×400
or,P2=515.625 torr