# Welcome to College Confidential!

## The leading college-bound community on the web

Join for FREE, and start talking with other members, weighing in on community discussions, and more.

Also, by registering and logging in you'll see fewer ads and pesky welcome messages (like this one!)

### As a CC member, you can:

• Post reviews of your campus visits.
• Find hundreds of pages of informative articles.
• Search from over 3 million scholarships.

# AP Chem problem- plz help

Registered User Posts: 2 New Member
edited January 2006
I don't really get this problem
It's about vapor pressure, and I dunno if I'm supposed to use the Ideal Gas Law because volume of the original liquid doesn't affect the vapor pressure at equilibrium.

A certain compound has a normal melting point of 41 degrees C & a normal boiling pont of 123 degrees C. The triple point is 39 degrees C and 85 mm Hg. The vapor pressure of the compound at 50 degrees is 120 mm Hg.
If 4.60 g of the compound (molar mass of 20.0 g/mol) is placed in a 2.00 L flask at 50 degrees C, what is/are the physical state(s) of the compound in the flask? Show by calculation.

I dont really kno how to calculate it. I'd appreciate if u guys can help.
Thanks
Post edited by JakeL5 on

## Replies to: AP Chem problem- plz help

• Registered User Posts: 35 Junior Member
i dont really remember that well cause chem was last year, but shouldnt you draw the graph with the pressure vs. temp, then use pv=nrt to find the pressure, and u have the temp so you can look at ur picture and see what state it is in
• Registered User Posts: 2 New Member
Thanks. I'll try that out.
This discussion has been closed.