Posted by Harry on Friday, February 14, 2014 at 6:10pm.
A sample of oxygen gas occupies 500.0 mL at 185°C and 75.0 cmHg. Calculate the temperature in °C if the gas has a volume of 221.0 mL at a 55.0 cmHg.

Chemistry  Steve, Friday, February 14, 2014 at 6:31pm
PV/T remains constant, so
(75.0)(500)/(185+271) = (55)(221.0)/T
T = 28°K
Note that we don't really have to convert to L and Pa, because the same conversion factors would be applied to both sides of the equation. The only wrinkle is the °C°K conversion, because that is additive, not multiplicative.

Chemistry  Harry, Friday, February 14, 2014 at 6:40pm
This answer is not correct

Chemistry  Devron, Friday, February 14, 2014 at 7:14pm
Steve gave you the combined gas law, but it seems that you were confused. The gas law is as followed:
P1V1/T1=P2V2/T2
Where
P1=75.0 cmHg
V1=500.0 mL
T1=273K +(185ºC)=88K
P2=55.0 cmHg
V2=221.0mL
and
T2=?
Solve for T2:
T2=[T1*(P2V2)]/P1V1
T2=[88K*(55.0 cmHg*221.0mL)/(75.0 cmHg*500.0 mL)
T2=28.6 K
Convert Kelvin to Celsius:
K=273K +C
K273=C
28.6273=244 º C <== Three significant figures
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