Methanol and ethanol form a nearly ideal solution at 300K A solution is made by mixing 32 g of methanol - Chemistry - Solutions

Question

Methanol and ethanol form a nearly ideal solution at 300K A
solution is made by mixing 32 g of methanol and 23 g of ethanol at
300 K Calculate the partial pressure of its constituents and the
total pressure of the solution ( At 300 K p0 CH3OH = 90 mm Hg p0
C2H5OH = 51 mm Hg

Vartika Jain · Accepted Answer

Dear Student,

Moles of methanol=MassMolar mass=32 g32 gmol-1=1 molMoles of ethanol=MassMolar mass=23 g46 gmol-1=0
5 molMole fraction of methanol, XCH3OH=Moles of methanolTotal molesor, XCH3OH=11+0
5=11 5=0
67Mole fraction of ethanol,XC2H5OH=1-XCH3OH =1-0
67=0
33Applying Raoult's law, Partial Vapour pressure of methanol = 0
67×90=60
3 mmPartial Vapour pressure of ethanol = 0
33×51=16 83 mmTotal pressure= 60 3 mm+16
82 mm=77 12 mm

Methanol and ethanol form a nearly ideal solution at 300K.A solution is made by mixing 32 g of methanol and 23 g of ethanol at 300 K .Calculate the partial pressure of its constituents and the total pressure of the solution.( At 300 K p0 CH3OH = 90 mm Hg p0 C2H5OH = 51 mm Hg