Enthalpy...please help me with this exercise

[agnieszka2807]

given thermochemical data on the following reactions (at 298,15K):
molar heat of combustion CH2CHCN(g) : -2044,6 kJ
molar heat of combustion C(spr) : -393,5 kJ
molar heat of combustion H2(g) : -285,9 kJ
molar heat of formation CHCN(g) : 129,7 kJ
molar heat of formation C2H2(g) : 226,7 kJ

DH=? DH-DU=? of HCN(g) + C2H2(g) = CH2CHCN(g)

[grgrsanjay]

write the reactions of combustion and formation involved in this reaction then adjust those such that you get the main reaction

:):):D:D