Using heats of formation tabulated in Appendix E, calculate the heats of reaction for the following. (a) C2H2(g) + 5/2 O2(g)→ 2 CO2(g) + H2O(e) (b) PC13(g) + CI2(g)→ PCI5(g) (c) C2H4(g) + H2O(g)→ C2H5OH(g) (d) Fe2O3(s) + 2 AI(s)→AI2O3(s)+2 Fe(e)

One mole of Carbon Dioxide burns completely in the presence of 3 moles of diatomic oxygen in a constant volume enclosure. The original temperature and pressure of the reactants are 25 C and 1 atm. A) If combustion takes place adiabatically calculate final temeprature and pressure of the products. B) If combustion does not take place adiabatically calculate the heat transfer per mole of CO when the products are cooled to a final temperature of 500K.

use JANAF tables from internet

2.4 kN В 1.7 kN 1.7 m 0.7 m \C 6.4 m For component directions, use x positive to the right and y positive upward.