Question

A gas has a volume of 400 mL at STP. If the temperature is held constant, what volume would the gas occupy at room temperature of 1.5 atm?

Answer 1

If you assume idea gas behaviour, then 266.67 ml.

Explanation:

If you assume that it behaves as an ideal gas, then you can use the relationship Pv = nRT. Therefore, v = (nRT)/P. Therefore, given that n, R and T are all constant, the volume will simply vary inversely with pressure.

Pressure at STP is 1 atm, so the pressure will decrease by 1/1.5 which is (1/1.5) x 400 = 266.67 ml.