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## Homework Statement

Lactose (C12H22O11; MM=342) is a sugar found in mamalian milk. The density of a 12.0% solution is approximately 1.06 g/mL. What is the molarity, molality, and mole fraction of the solution?

## Homework Equations

M=g/L, m=mol/kg, molefraction=mol/mol??

## The Attempt at a Solution

I think I can get this one if I can just determine the molarity. I definitely did something wrong.

M=mol/L

1.06 / 1000 = .00106; .00106/342 = 3.099x10^-6M

I figured since I know g/mL as well as mol/g, I can divide to get mol/mL, then convert to get L. Apparently this is not the case?