Posted by **Kaitlyn** on Monday, November 19, 2012 at 7:28pm.

If argon has a volume of 5.0 dm3 and the pressure is .92 atm and the final temperature is 30 degrees celcius and the final volume is 5.7 L and the final pressure is 800 mm Hg, what was the initial temperature of the argon?

- Chemistry -
**DrBob222**, Monday, November 19, 2012 at 7:34pm
(P1V1/T1) = (P2V2/T2)

Remember T must be in kelvin.

- Chemistry -
**Matt**, Monday, November 19, 2012 at 7:42pm
5.0 dm^3= 5 Liters

(P1V1/T1)=(P2V2/T2)

P1= .92 atm

V1= 5.0 L

T1=?

P2= (800 mmHg/760 mmHg)= 1.05 atm (There are 760 mmHg in 1 atmosphere)

V2= 5.7 L

T2= 30 degrees Celsius

((.92 atm)*(5.0 L))/(T1)=((1.05 atm)*(5.7 L))/(30 Degrees)

4.6/T1= .1995

4.16/.1995= T1

T1= 20.8 Degrees Celsius

- Chemistry -
**Matt**, Monday, November 19, 2012 at 7:44pm
@DrBob222- Temperature does not need to be in Kelvin because it is a ratio, converting to Celsius would give her the same answer.

- To Matt--Chemistry -
**DrBob222**, Monday, November 19, 2012 at 10:13pm
I beg your pardon. My calculations show two things.

a. your math is not right.

b. your chemistry is way not right.

The ratio of T is NOT the same and T is not the same.

Your method.

(0.92*5/T1) = (1.05*5.7/30)

T1 = (0.92*5*30)/(1.05*5.7)] = 23.06 which I would round to 23.1. I assume degrees C. But this is incorrect.

The correct method.

4.6/T1 = (5.7*1.05/303) = 0.01975

T1 = 0.01975/4.6 = 232.88 K which is 232.88-273.15 = -40.26 C.

BIG DIFFERENCE.

Temperature MUST be in kelvin.

- Chemistry -
**zach**, Tuesday, February 4, 2014 at 9:12pm
how do i find out what the normal boiling point of a liquid could be if the vapor pressure of the liquid is .92 atm at 60 degrees celsius?

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