Hess’s Law Problem: Show your work neatly and methodically.
1. From the enthalpies of reaction PUT *** BY ANY REACTIONS THATCORRESPOND IN A ΔH FORMATION
H2(g) + F2(g) ---->2 HF(g) ΔH = -537 kJ
C(s) + 2 F2(g)----> CF4(g) ΔH = -680 kJ
2 C(s) + 2 H2(g)------> C2H4(g) ΔH = +52.3 kJ
Calculate ΔH for the reaction of ethylene with F2:
C2H4(g) + 6 F2(g) ----> 2 CF4(g) + 4 HF(g) ΔHRXN = ????
2.Use Hess’s Law to calculate ΔH for the reaction
NO(g) + O(g) ---> NO2(g) given the following information:
NO(g) + O3(g) ---> NO2(g) + O2(g) ΔH = -198.9 kJ
O3(g) ----> 1.5 O2(g) ΔH = -142.3 kJ
O2(g) ---> 2 O(g) ΔH = +495.0 kJ
3.Use Hess’s Law to calculate ΔH for the reaction N2O(g) +NO2(g) ----> 3 NO(g) given the following information:
2 NO(g) + O2(g) ----> 2 NO2(g) ΔH = -113.1 kJ
N2(g) + O2(g) ----> 2 NO(g) ΔH = +180.7 kJ
2 N2O(g) -----> 2 N2(g) + O2(g) ΔH = -163.2 kJ
