Question

A solution is made by mixing 43.0 mL of ethanol, C2H6O, and 57.0 mL of water. Assuming ideal behavior, what is the VAPOR pressure of the solution at 20 °C?

Answer 1

Use Raoult's Law

Answer 2

I tried but I just can't seem to get the right answer

Answer 3

@aaronq

Answer 4

wanna post what you did?

Answer 5

@aaronq

Answer 6

@aaronq

Answer 7

Okay thats great. now that you have the moles, find the mole fractions

\(\sf \chi _A=\dfrac{moles~of~A}{total~moles}\)

Answer 8

I got the mole fraction of ethanol to be 0.189 and the mole fraction of water to be 0.811
@aaronq

Answer 9

k perfect!

Now you need to multiply them by the vapour pressures of the pure solvents

Answer 10

Got the answer!! thank you so much for your help !!! @aaronq

Answer 11

no problem! glad i could help