Conversion of Volume

Question

A sample of krypton gas at a pressure of 810 mm Hg and a temperature of 80°C, occupies a volume of 13.2 liters. If the gas is cooled at constant pressure to a temperature of 51°C, the volume of the gas sample will be ? L.

Answer 1

Constant pressure indicates Charles' Law:

V₁/T₁ = V₂/T₂

V₂ = T₂ x (V₁/T₁)

V₂ = (51 + 273.15)K x (13.2 L/(80 + 273.15)K)

V₂ = 12.1 L

*Note: you must always convert from Celsius to absolute temperature in Kelvin:

C + 273.15 = K