Discover the Isochoric Process: Calculating Temperature in a Sealed Tank

[gothicsh]

A 3.00-L tank contains air at 3.00 atm and 20.0 C. The tank is sealed and cooled until the pressure is 1.00 .
What is the temperature then in degrees Celsius? Assume that the volume of the tank is constant.



P/T=const

3/20=1/T, T=6.67 C

Why it's not right?

 

[gothicsh]

nvm, i got it

 

[spirit89]

temp should be expressed in kelvin units not "C"