The heat of formation of ammonia at `25^(@)C` is-4 7 kJ. The correct equation which represents this value is :

Options

A. `(1)/(2)N_(2(g))+(3)/(2)H_(2(g))=NH_(3(g))`
B. `N_((g))+3H_((g))=NH_(3(g))`
C. `N_(2(g))+3H_(2(g))=2NH_(3(g))`
D. `(1)/(2) N_(2(g))+(3)/(2)H_(2(g))=NH_(3(l))`

Answer

A

Explanation

Formation reaction for ammonia is, when one mole of `NH_(3)` is formed. Therefore reaction is
`(1)/(2)N_(2(g)) +(3)/(2)H_(2(g)) rarr NH_(3(g))`