H_(2)+Cl_(2)to 2HCl,Delta H_(1),N_(2) +3H_(2)to 2NH_(3), DeltaH_(2)" and "NH_(3)+3Cl_(2)to NCl_(3)+3HCl,DeltaH_(3) Then calculate the heat of formation of nitrogen trichloride.

H_(2)+Cl_(2)to 2HCl,Delta H_(1),N_(2) +3H_(2)to 2NH_(3), DeltaH_(2)" a

1.	H_(2)+Cl_(2)to 2HCl,Delta H_(1),N_(2) +3H_(2)to 2NH_(3), DeltaH_(2)" and "NH_(3)+3Cl_(2)to NCl_(3)+3HCl,DeltaH_(3) Then calculate the heat of formation of nitrogen trichloride.
Answer» ANSWER :`DeltaH_(3)+(DeltaH_(2))/2-(3DeltaH_(1))/2`