`NH_(3)(g) + 3Cl_(2)(g) rarr NCl_(3)(g) + 3HCl(g), " "DeltaH_(1)`
`N_(2)(g)+3H_(2)(g)rarr 2NH_(3)(g), " "DeltaH_(2)`
`H_(2)(g)+ Cl_(2)(g) rarr 2HCl(g) , " " DeltaH_(3)`
The heat of formation of `NCl_(3)` in the terms of `DeltaH_(1), DeltaH_(2) "and" DeltaH_(3)` is
A. `Delta H_(f) = - Delta H_(1) + (Delta H_(2))/(2) - (3)/(2) Delta H_(3)`
B. `Delta H_(f) = Delta H_(1) + (Delta H_(2))/(2) - (3)/(2) Delta H_(3)`
C. `Delta H_(f) = Delta H_(1) - (Delta H_(2))/(2) - (3)/(2) Delta H_(3)`
D. None
