Gas A is reacted with gas B in a batch reactor according to:

A $+3$B $3$C

Stoichiometric ratio of A and B are mixed in the fixed volume reactor at $37\mathrm{.}9$oC and a total absolute pressure of $2$ atm. The mixture starts to react and the reaction goes to completion at $2\mathrm{.}5$ atm. What is the final temperature of the reaction mixture in K$,$ assuming ideal gas behaviour?

T$($K$)=$ T$($oC$)+273\mathrm{.}15$