The final temperature is
Using the ideal gas law,
however, the number of moles is constant as well, given the fact that the gas is simply heated, so the ecuation becomes
This will result in
keep in mind the temperature must be transformed in Kelvins by adding 273.15 (I just added 273 for simplicity)...
Finally, check to see if the answer make sense...the pressure is increasing in a constant volume, so the temperature MUST be bigger than