Posted by **Anonymous** on Thursday, November 3, 2011 at 4:11pm.

A 2.30 L sample of O2(g) was collected over a liquid at a total pressure of 785 torr and 25°C. When the O2(g) was dried (vapor of that liquid removed), the gas had a volume of 1.93 L at 25°C and 785 torr. Calculate the vapor pressure of this liquid at 25°C.

- chem -
**DrBob222**, Thursday, November 3, 2011 at 6:22pm
Use PV = nRT

Solve for n=PV/RT for the first set of conditions which will give you total n (moles vapor + moles O2).

Then calculate n = PV/RT for the second set of conditions which gives just moles O2.

Subtract to find moles liquid vapor, then use PV = nRT and solve for P of the liquid (vapor of the liquid).

## Answer this Question

## Related Questions

- AP CHEM-URGENT PLEASE - at 25 degrees C liquid A has a vapor pressure of 100.0 ...
- chemistry - A 0.0677 g sample of magnesium metal reacted with excess ...
- Chem - A certain liquid has a vapor pressure of 92.0 Torr at 23.0 °C and 216.0 ...
- chemistry - The volume of a sample of a gas collected over water at 32 Celsius ...
- Dr. Bobb222 - When you get a chance: If the pure liquid vapor pressure of ...
- chem - A sample of O2 gas was collected over water at 23ºC and 711 torr. What ...
- Ap Chemistry - at 25 degrees Cliquid A has a vapor pressure of 100.0 torr, while...
- Chemistry - Help please? 1)A sample of propane gas occupies 625 cm3 at 20.0 °C ...
- chemistry - Acetylene(C2H2), an important fuel in welding, is produced in the ...
- AP Chem - a 4.22 gram sample of copper II sulfide was added to excess ...

More Related Questions