What is the composition of the vapor in equilibrium with a liquid mixture of 60.

Question

What is the composition of the vapor in equilibrium with a liquid mixture of 60.6 mol% propane and the remainder n-butane at 80 F? Assume the vapor pressures and heats of vaporizations of the two components are only known at 70F as [124 psia and 145 Btu/lbm] and [32 psia and 156 Btu/lbm] for propane and n-butane respectively. For small ranges of temperature, the heat of vaporization and the compressibility factor of the vapor can be assumed constant. The specific volume of the liquid may be assumed very small compared to the specific volume of the gas.

Explanation / Answer

What is the composition of the vapor in equilibrium with a liquid mixture of 60.

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