Posted by **ellie** on Thursday, October 24, 2013 at 8:38pm.

A 0.286g sample of carbon dioxide, CO2, has a volume of 585mL and a pressure of 495mmHg . What is the temperature, in kelvins and degrees Celsius, of the gas?

- chemistry -
**DrBob222**, Thursday, October 24, 2013 at 8:48pm
Use PV = nRT.

P = 495 mm; convert to atm.

V = 585 mL; convert to L.

n = g/molar mass = 0.286/44 = ?

R = you know

T = kelvin. Substitute and solve for T in kelvin, the

K = 273 + C to calculate C.

- chemistry -
**ellie**, Thursday, October 24, 2013 at 9:08pm
When I've done the equation I've gotten 713.971 K for the first part. What have I done wrong?

- chemistry -
**DrBob222**, Thursday, October 24, 2013 at 9:33pm
Probably nothing. Using 44 for the molar mass of CO2 I obtained 714.3 K. You may have punched in a wrong digit somewhere.

For n I have 0.286/44 = 0.00650

Using 44.01 for the molar mass gave me 714.5 K.

- chemistry -
**ellie**, Thursday, October 24, 2013 at 9:37pm
thanks for your help

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