4. (30 pts) Gaseous benzene (C6H6) is mixed thoroughly with 200% theoretical air and ignited to burn completely in a closed rigid tank. The reactants are originally at 25 °C

and 1 atm. The final temperature of the products is 700 K. (a) Determine the heat transfer per kmol of benzene. (b) Determine the final pressure of the products, assuming that all constituents of the reactants and products can be considered as ideal gases. \bar{q}-\bar{w}+\sum_{n} N_{l}\left[\bar{h}_{f . t}^{\mathrm{o}}+\Delta \bar{h}_{s, d}\left(T_{n}\right)-\bar{R} T_{n}\right]-\sum_{p} N_{l}\left[\vec{h}_{f, l}+\Delta \bar{h}_{s, l}\left(T_{p}\right)-\bar{R} T_{p}\right]=0 \quad \text { (steady state) }