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At 350K, pure toluene and hexane have vapor pressures of 3.57 x 10^4 Pa and 1.30...

At 350K, pure toluene and hexane have vapor pressures of 3.57 x 10^4 Pa and 1.30 x 10^5 Pa respectively. a) Calculate the mole fraction of hexane in the liquid mixture that boils at 350 K at a pressure of 1 atm. b) Calculate the mole fraction of hexane in the vapor that is in equilibrium with the liquid part (a).

I have looked up the answer and can follow, but I do not understand how to determine the value of P total. In the answer it says Ptot = 1.01325 x 10^5 Pa, but does not show how it was obtained. How do I determine Ptot?

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