Question

The density of liquid carbon dioxide is about 0.8 g/cm^3. What volume fraction inside the fire extinguisher (when full) is occupied by CO2? The density of CO2 gas is negligible compared to the density of liquid CO2.
My answer was 75%. Please verify. Thanks.

Answer 1

V (fire extinguisher) = 7.1*10^-3 m^3
Mass CO2 = 4.5 kg
T =293 K
Pressure = 60*10^5 Pa

Answer 2

V(co2) = (4500g/0.8g) * 1cm^3=5625 cm^3

V(co2)/Vex = 5625/7.1*10^3 = 0.79 = 79%.