A mixture at a flow rate of 2000 kmol/h containing 25% propane, 15% n-butane, 20% n-pentane and 40% n-hexane as mole percent is fed to a flash distillation column operating at 60C and 250 kPa.

a) Calculate the amount and composition of the vapor and liquid phases formed.

b) Prepare a computer program that performs the above required calculations and prints the results.