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February 1, 2015

February 1, 2015

Posted by **Anna** on Sunday, November 9, 2008 at 3:57pm.

What is the equation?

- AP Chem -
**Trig**, Sunday, November 9, 2008 at 4:03pmAlways start with PV/nT = PV/nT, where P is the pressure, V is the volume, n is the number of moles, and T is the temperature. Take out whichever terms you don't need. In this case, you don't need n (the number of moles), so you're left with:

PV/T = PV/T

Solve for the V on the right side of the equation after you plug in everything else.

- AP Chem -
**Anna**, Sunday, November 9, 2008 at 4:12pmI did that and got -22.7.

1st of all the answer is supposed to be .65 L

2nd of all where does the negative go?

- AP Chem -
- AP Chem -
**Trig**, Sunday, November 9, 2008 at 4:09pm( You only use PV=nRT when none of the variables change. In this case the temperature is changing, so you use PV/nT = PV/nT )

- AP Chem -
**Trig**, Sunday, November 9, 2008 at 4:25pmTemperature must always be in Kelvin! Add 273 to the temperature in Celsius to get the temperature in Kelvin. In this case:

INITIAL TEMPERATURE = 22+273 = 295 K

FINAL TEMPERATURE = -197+273 = 76 K

- AP Chem -
**Anna**, Sunday, November 9, 2008 at 4:28pmooh ok that explains it lol thanks =]

- AP Chem -

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