The vapor pressure of water is about 0.030 arm at 25C what is the vapor pressure of a solution made by adding 5 miles of antifreeze (ethylene glycol) to 1L of water?

Arm
0.040
0.028
0.015
0.008

Question

The vapor pressure of water is about 0.030 arm at 25C what is the vapor pressure of a solution made by adding 5 miles of antifreeze (ethylene glycol) to 1L of water?

Arm
0.040 
0.028 
0.015
0.008

photon336 · Answer

adding a substance will lower vapor pressure. so I think A. is out immediately

photon336 · Answer

that is to a solution. not sure how to set this one up

anonymous · Answer

It looks like this is exactly what you need: http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Ideal_Solutions/Changes_In_Vapor_Pressure%2C_Raoult's_Law#Nonvolatile_solutes I haven't seen this sort of thing in a while so I'm trying to catch up to understanding this problem too right now, so let's see if we can use this example to get the same answer for your question.

photon336 · Answer

Yeah.. i honestly don't know either

photon336 · Answer

I haven't seen too many questions about Raoults law

jfraser · Answer

the change in vapor pressure will be proportional to the mole fraction of the solute in the solution, if I remember it properly

jfraser · Answer

$$P_{soln} = P^0*X$$

photon336 · Answer

@Woodward $$P ^{0} = pressure of pure substance $$? don't remember

jfraser · Answer

yes, it is

photon336 · Answer

Will look into this more