1A The Activity Coefficients 227 And 72 1041 Were

Question

1a) The activity coefficients า.-2.27 and 72-1041 were found for a methanol (1)-ethy acetate (2) …

1a) The activity coefficients า.-2.27 and 72-1041 were found for a methanol (1)-ethy acetate (2) system at 313.15 K and 0.2. Calculate the excess Gibbs energy in this mioxture. 1b) Using the van der Waals equation of state calculate the pressure and compressibility factor of a substance whose critical temperature is 800 K and critical pressure is 8.314 MPa, at a temperature of 1000K and a molar volume of 1100 cm3 mol- Pr ART

Solutions

Expert Solution

1a) The excess gibbs free energy is given by,

where =
activity coefficient of i-th component, xi = mole
fraction of i-th component, R= universal gas constant,
T=temperature of the system. x1=0.2 so x2= 1
– 0.2 = 0.8

putting the values,

= 509.93 J


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