Question

The reaction of cyanamide, NH₂CN_(s) with oxygen was run in a bomb calorimeter and ΔU was found to be –742.24 kJ mol^–1. The magnitude of ΔH₂₉₈ for the reaction

is ...... kJ. (Rounded off to the nearest integer) [Assume ideal gases and R = 8.314 J mol^–1 K^–1]

Answer 1

ΔH = ΔU + ΔN_gRT

= -742.24 + \(\frac{1}{2}\times\frac{8.314}{1000}\times298\)

= - 741 kJ/mol