[Misha]

I have a problem that states the following:
Calculate the mole fractions in a solution that is made of 25.0 g of ethyl alcohol, C2H5OH and 40.0g of water.

My question is, what are 'mole fractions'?

[Mitch]

Well first convert everything from gams to moles and then we'll move on from there.

[Borek]

Less then 30 seconds using CASC  

Molar fraction: express amount of every substance in solution in moles. Sum the moles. Divide moles of substance by the total moles of all substances - that's the molar fraction.

[Nano]

mole fraction is like partial pressure in gas?
a quick thought

[Borek]

There is some analogy. The main difference is that sum of all molar fractions is always 1, while the sum of partial pressures is just total pressure.

[Nano]

There is some analogy. The main difference is that sum of all molar fractions is always 1, while the sum of partial pressures is just total pressure.

Learn a new lesson, thanks!