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2NO --> N2 + O2 ΔH = -43,2 kkal
mol NO = massa/Mr
= 45/(14+16)
= 45/30
= 1,5 mol
2 mol NO = -43,2
1,5 mol NO = (-43,2 x 1,5) / 2
= -64,8 / 2
ΔH = -32,4 kkal