chemistry
posted by kelvin .
If methane at a pressure of 3.2 atm and at 21 °C is introduced into a container, the gas be heated to ______°C to increase the pressure to 12 atm.

Temperature and Pressure are proportional. If you increase the temperature, the pressure will increase.
P1/T1 = P2/T2
Temperature has to be in Kelvin
C + 273 = K 
i got 352 is that right

I got something different:
3.2/294 = 12/K
That gives us the Kelvin temp then subtract 273 to get C. 
i got 831 i don't think this is right???