(a) What is Poynting pressure correction factor? Discuss its application.

(b) It is known that benzene (1) and toluene (2) form an ideal liquid solution. If a liquid mixture of benzene and toluene having \(x_{1}=0.6\) is heated in a closed vessel at 760 torr, determine the temperature at which vaporization starts and composition of the vapour that forms. Calculate upto 3 iterations.
The Antoine constants for benzene and toluene are as follows:

(c) Assuming \(\Delta H^{0}\) is constant in the temperature range \(298.15 \mathrm{~K}\) to \(800 \mathrm{~K}\), estimate the equilibrium constant at \(800 \mathrm{~K}\) for the following reaction:
\[ \mathrm{SO}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g}) \]
At \(298.15 \mathrm{~K}\), equilibrium constant \(\mathrm{K}\) is \(1.779 \times 10^{12}\).
\[ \begin{array}{cc} \text { Components } & \Delta H_{f}^{0}(\mathrm{~kJ} / \mathrm{mol}) \\ \mathrm{SO}_{2}(\mathrm{~g}) & -297.263 \\ \mathrm{SO}_{3}(\mathrm{~g}) & -395.234 \end{array} \]

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A B C Benzene (1) Tolucnc (2) 6.87987 1196.760 219.161 6.95087 1342.310 219.187