Try it yourself
Question
Calculate the mass of oxygen that occupies 0.250 m3 in the liquid state, if the densityThe density of a material is the mass of 1 cm3 (or 1 m3) of the material. It is a measure of the compactness of a material. Density is measured in grams per centimetre cubed (g/cm3) or kilograms per metre cubed (kg/m3). of liquid oxygen = 1.1 g/cm3.
m = v x p
p = 1.1 g/cm3 = 1100 kg/m3
(Remember to convert from g/cm3 to kg/m3 you multiply by 1,000)
v = 0.250 m3
m = 0.250 m3 x 1100 kg/m3
m = 275 kg
The mass of 0.250 m3 of oxygen in the liquid state is 275 kg.
Question
Calculate the mass of oxygen that occupies 0.250 m3 in the gas state. (Density of oxygen gas = 0.0014 g/cm3)
m = v x p
p = 0.0014 g/cm3 = 1.4 kg/m3
(Remember to convert from g/cm3 to kg/m3 you multiply by 1,000)
v = 0.250 m3
m = 0.250 m3 x 1.4 kg/m3
m = 0.35 kg
The mass of 0.250 m3 of oxygen in the gas state is 0.35 kg.
Liquid oxygen has much greater mass than an equal volume of oxygen gas because the density of liquid oxygen is very much greater than the density of oxygen gas.
