Suppose there is an unsaturated solution of Na_2SO_4. (a) How many phases and co

Question

Suppose there is an unsaturated solution of Na_2SO_4. (a) How many phases and components are present. What is the variance (the number of degrees of freedom) of the system? Identify the independent variables. The vapour pressure of pure liquid A at 293 K is 68.8 kPa and that of pure liquid B is 82.1 kPa. These two compounds form ideal liquid and gaseous mixtures. Consider the equilibrium composition of a mixture in which the mole fraction of A in the vapour is 0.612. Calculate the total pressure of the vapour and the composition of the liquid mixture.

Explanation / Answer

Phases in unsaturated sodium sulphate solution are two :-

Na2SO4 (s)

Na2SO4 (solution)

Number of components is smallest number of independently variable constituents,which are two here as described

Na2SO4 +H2O (solution)

Na2SO4.H2O(s)

Number of degrees of freedom are minimum number of independently variable factors.

For a two component system having two phases in equilibrium ,the degree of freedom is two.

Both temperature and pressure are independently variable factors.

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