Check the back of your book? Index C or something like that.
#3
shredder666
63
0
anywhere includes all the books I have
#4
Zeppos10
86
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(at the ocassion of the first aniversary of this question)
the enthalpy of atomisation of nitrogen monoxide is close to 632 kJ/mol.
This may be a fair first estimate of the bond enthalpy of N=O.