Question

Consider the following partially labelled figure for an ideal binary solution of benzene and toluene and answer the following questions:
What is $p_{\text{toluene}}^{\circ }\left({25}^{\circ }\text{C}\right)$?

• A. $30\text{mm Hg}$
• B. $100\text{mm Hg}$
• C. $22\text{mm Hg}$
• D. $40\text{mm Hg}$

Answer 1

The correct option is A $30\text{mm Hg}$

To solve this question we have to assume that curve has been plotted at ${25}^{0}C$
Now the straight line 2 representing the vapour pressure of toluene has the value of 30 mmHg at $x_T$=1
So $P^{0}toluene=30mmHg$