The reaction of cyanamide NH2CNs,  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 reactionNH2CNs+32O2g→O2g+H2O1  Is_____kJ. (Rounded off to the nearest integer) [Assume ideal gases and R=8.314  J  mol−1K−1]