Question

methanol and ethanol are common organic solvents. if the mole fraction of CH3OH in a mixture of the two solvents is 0.4 what is the mole fraction of methanol in the vapor in equilibrium wih the liquid mixture at room temperature 25 celius. the vapor pressure ofmethanol and ethanol at 25 celius are 122.7 torr and 58.9 torr

Answer 1

PCH3OH = XCH3OH*Po = 0.4*122.7
PC2H5OH = XC2H5OH*Po = 0.6*58.9
Total P = PCH3OH + PC2H5OH

XCH3OH vapor = PCH3OH/total P

Answer 2

Note the spelling of celsius.