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Problem on empirical van Laar equation

At atmospheric pressure ethyl acetate and ethyl alcohol form an azeotropic mixture containing 53.9% mole of ethyl acetate and boiling at 71.8°C.

a) Estimate the values of A & B in the empirical van Laar equation

log10 γ1 = A/[1+ (Ax1/Bx2)2]

log10 γ1 = B/[1+ (Bx2/Ax1)2]

b) If A & B are constant, calculate the azeotropic composition and the corresponding total pressure for boiling at 56.3°C.

Data: Vapour pressures of pure components (in mmHg):

                             71.8°C     56.3°C
Ethyl Alcohol           587          298
Ethyl Acetate           636          360

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