Chemistry help

Question

A sample of gas at STP occupies 1.64 L. What volume would the gas occupy at 3.4 atm of pressure and -78 ⁰C?

Answer 1

At STP you have

P1= 1 atm

V1 = 1.64 L

T1 = 273 K

 

At the other condition you have 

P2 = 3.4 atm

V2 = ?

T2 = -78ºC + 273 = 195 K

 

P1V1/T1 = P2V2/T2 and solving for V2 you obtain

V2 = P1V1T2/P2T1 = (1 atm)(1.64 L)(195 K)/(3.4 atm)(273 K) = 0.345 liters