[laxplayer]

The problem states:
A mixture of gases contains 5.84 g of N2, 5.31 g of H2, and 8.21 g of NH3. If the total pressure of the mixture is 2.86 atm, what is the partial pressure of each component?

I know that all of the pressures have to add up to 2.86 atm because of Dalton's Law, but that's about it :] I don't understand how you go from grams of a substance to finding pressure of it, without knowing the temperature or volume.

[Borek]

Do you know what mole fraction is and how it is related to partial pressure?

[laxplayer]

Aren't the mole fractions the moles of one substance over the moles of the total? But I don't know how they're related.

[Borek]

http://en.wikipedia.org/wiki/Partial_pressure

[laxplayer]

oh, so they're equal. P₁/P=n₁/n right? So does that mean (.2084 mol N2)/(3.32433 mol total)=(X atm N2)/(2.86 atm total)?

[laxplayer]

It says I got it right!