(a) Calculate the enthalpy change for the reaction below using the thermochemical data
given. (4)
NO(g) + O(g)  NO2(g)
Thermochemical data:
DH°f for O3(g) DH° = + 214 kJ/mol
O2(g)  2O(g) DH° = + 495 kJ
NO(g) + O3(g)  NO2(g) + O2(g) DH° = – 199 kJ

Question

(a) Calculate the enthalpy change for the reaction below using the thermochemical data
given. (4)
NO(g) + O(g)  NO2(g)
Thermochemical data:
DH°f for O3(g) DH° = + 214 kJ/mol
O2(g)  2O(g) DH° = + 495 kJ
NO(g) + O3(g)  NO2(g) + O2(g) DH° = – 199 kJ

anonymous · Answer

c) Consider the following two reactions:
1. H2O(g)  H2O(l)
2. C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(g)
Give the sign ( + or – ) for q and w for each reaction in the table below: (4)
Reaction Sign of q Sign of w
1.
2.