Enthalpy Change Calculation

The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and ∆U was found to be −742.24kJmol−1. The magnitude of ∆H298 for the reaction NH2CN(s)+‌

3

2

O2(g)⟶N2(g)+O2(g)+H2O(l) is ............. kJ (Rounded off to the nearest integer).
[Assume ideal gases and
R=8.314Jmol−1K−1 ]