Consider the reaction :
4NO2(g) + O2(g) ® 2N2O5(g), ΔrH = –111kJ.
If N2O5(s) is formed instead of N2O5(g) in the above reaction, the ΔrH value will be:
(given, ΔH of sublimation for N2O5 is 54 kJ mol–1)
–219 kJ
–165 kJ
+ 54 kJ
+ 219 kJ
Next Question
The standard enthalpy of formation of NH3 is –46.0 kJ mol–1. If the enthalpy of formation of H2 from its atoms is –436 kJ mol–1 and that of N2 is –712 kJ mol–1, the average bond enthalpy of N — H bond is NH3 is