Question

5. Ethanol and methanol are form an ideal solution at 20 °C. Vapor pressure of pure ethanol and pure methanol at 20 °C is 44.5 and 88.7 mmHg, respectively. If 100 g of ethanol and 100 g of methanol are mixed into a solution, calculate: (a) the mol fractions of ethanol and methanol in the solution, (b) the partial pressures of ethanol and methanol and total pressure of the solution, and (c) the mol fraction of methanol in a vapor phase.

Answer 1

. Mole praction of methanol in vapeur phone L 70.598 Goethened . 52.333 0.14 overaner s o Mole fraction of puthead in unserer in Methand traction E Mole idl there in 0.74. 11

Erhande Canton Methand chon Mole fraction of such Methand 100g 100g (in 145 mming (Po= 88.7 minity) I lethand als in achand & n ruthanat allenge Wt DO ethand a . 2.17 41 M-Wt Metronet : : 3.125 3.125 sere 32 sed s tants la on 2.17 e of red 212 ethand : $ 0.41 0.41 Reizt 3.120 rea . & Methand & 1 - Yethend (as NAT Moth: 1) Se Pruthand & 1-0.41 & 0.59 b) partial preson of each & total pressure. м а Y, P, Petrand 0.41x44.5 - 18.245 many Pruthand 0.59 X 087 = 52.333 MM Total Pressure - Pettend & Prethand - 70.578 monity
y