- #1

enymh2

- 1

- 0

## Homework Statement

(a) The activity coefficients at infinite dilution for isopropanol and water are 11.825 and 2.986 respectively at 80°C and 1 atm.

i) Calculate the van Laar Coefficients A12 and A21

**2. Relevant equation.**

A12=lnγ (1+((x2lnγ2)/( x1lnγ1))^2)

The eqaution for A21 is the same except 1 and 2 are reversed.

Given the antoine eqaution for the two liquids also.

At infinitely dilute solution, for A12 the x1 value will become 0 and for A21 the x2 value will become 0. Therefore i would be left with just A12=lnγ? but this doesn't give me the right answer.

A12=lnγ (1+((x2lnγ2)/( x1lnγ1))^2)

The eqaution for A21 is the same except 1 and 2 are reversed.

Given the antoine eqaution for the two liquids also.

## The Attempt at a Solution

At infinitely dilute solution, for A12 the x1 value will become 0 and for A21 the x2 value will become 0. Therefore i would be left with just A12=lnγ? but this doesn't give me the right answer.