A solution is made by mixing 48.5 g acetone (CH 3
COCH 3
) and 48.5 g methanol (CH 3
OH). What is the vapor pressure of this solution at 25 ∘
C ? What is the composition of the vapor expressed as a mole fraction? Assume ideal solution and gas behavior. (At 25 ∘
C the vapor pressures of pure acetone and pure methanol are 271 and 143 torr, respectively.) The actual vapor pressure of this solution is 161 torr. Explain any discrepancies. P ldeal =
χ acetoon V
=
χ methanol V
=