An unknown gas has a volume of 200L at 1.7atm. What is ots volume at STP?

Answer 1

Pressure - volume relationship:

P1V1 = P2V2 @ constant temperature (you did not specify the initial temperature so I'll assume it is standard)

P1 = 1.7 am

V1 = 200 L

P2 = 1 atm (standard pressure)

V2 = ?

(1.7 atm)(200 L) = (1 atm)(V2)

V2 = 340 L