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## Homework Statement

The mass fraction of benzene in a benzene-toluene mixture is 0.450. What is the mole fraction of toluene in the mixture? Molecular weights of benzene and toluene are 78.11 and 92.12 respectively.

## Homework Equations

listed

## The Attempt at a Solution

Mass fraction of toluene is .550

Now, that is dimensionless, and I don't know how to get going from here. I know it's simple, but I've forgotten my general chemistry...

I was thinking I just multiply that mass fraction by the molecular weight of toluene, but then that's still in g/mol...then I thought about adding them, which would make more sense (since I have the mass fraction). I dunno though, because I don't have the exact chemical formula.

Any tips or steps would be greatly appreciated. Thank you.