If only gases remain after 12 g carbon is treated with 49. 26 litre of air at 300 K and 
2 atm pressure (Assume 20% by volume of  $O_2$, 79% by volume of $N_2$   and 1% by  volume of inert gases are present in air). Total amount of heat released in this reaction is  ………. $(\Delta H_{f}forCOandC{O}_{2}are-26kcalmo{l}^{-1}and-94kcalmo{l}^{-1})$ 
(No reactants are left unreacted after the reaction) (R = 0.0821 $Latm{\text{\hspace{0.17em}mol}}^{-1}{\text{ K}}^{-1}$ )