KVPY2020ChemistrySolutions
A mixture of toluene and benzene forms a nearly ideal solution. Assume P B ° and P T ° to be the vapor pressures of pure benzene and toluene, respectively. The slope of the line obtained by plotting the total vapor pressure to the mole fraction of benzene is:-
Options
- AP B ° - P T °
- BP T ° - P B °
- CP B ° + P T °
- DP B ° + P T ° / 2
Correct answer
A. P B ° - P T °
Step-by-step solution
P total  = χ B P B 0 + χ T P T 0 = χ B P B 0 + 1 - χ B P T 0 Comparing it with y = mx + c P total  y = χ B x P B 0 - P T 0 ⏟ m + P T 0 ⏟ c