Benzene and toluene form an ideal solution. At 25 oC, the vapor pressure of pure benzene...

Benzene and toluene form an ideal solution. At 25 oC, the vapor pressure of pure benzene is 100 torr, and the vapor pressure of pure toluene is 30.0 torr. A solution is prepared of 1.0 mol benzene and 2.0 mol toluene. Some of the solution evaporates in a closed system. What is the mole fraction of benzene in the vapor?

A. 0.33

B. 0.43

C. 0.53

D. 0.63

E. 0.73

Solutions

Expert Solution

total no of moles = no of moles of benzene + no of moles of toulene

= 1+2 = 3

mole fraction of benzene = no of moles of benzen/total no of moles

1/1+2 = 1/3 = 0.33

mole fraction of toulene = 2/1+2 = 2/3 = 0.66

A. 0.33 >>>>>answer

queen_honey_blossom answered 1 year ago

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