# Need help with chem problem

1. Sep 18, 2007

### jdhutto

1. The problem statement, all variables and given/known data

A solution is made by disolving 0.40 mol isopropanol (C3H7OH) in 0.70 mol water.
(a) What is the mole fraction of isopropanol?

(b) What is the mass percent of isopropanol?
%
(c) What is the molality of isopropanol?
m

2. Relevant equations

3. The attempt at a solution

Not sure what steps to take here?

2. Sep 18, 2007

### motoman3390

Whoa man why are you posting so many times, if they don't answer they don't answer. I've been waiting for an answer, if someone knows then they'll hopefully help you if not? posting 20 times won't help.

3. Sep 18, 2007

### hage567

Do you know the definitions of each of those quantities? Can you show the equations for them? Check your book. Tell us what is giving you trouble. You need to show more effort, we can't do all the work for you!

4. Sep 18, 2007

### jdhutto

mole fraction= amount (mol) of solute / amount (mol) of solute + amount (mol) of solven

mass percent= mass of solute/ mass of solute + mass of solvent x 100

molality = amount mol of solute/ mass kg of solvent

i know the equations do i just plug the quantities in or is there more to it than that

5. Sep 18, 2007