For the reaction #N_2(g) + 3H_2(g) rarr 2NH_3+Delta#...what is #Delta_"rxn"#?

1 Answer
anor277
Nov 26, 2017

For the reaction.....#N_2+3H_2(g) rarr 2NH_3(g)#

#DeltaH_"rxn"^@=2xxDeltaH_"formation of ammonia"^@#

Explanation:

#DeltaH_"rxn"^@=2xxDeltaH_"formation of ammonia"^@#

,,where #DeltaH_"formation of ammonia"^@# is the enthalpy of formation of ONE MOLE of ammonia in its standard state from its constituent elements in their standard states under standard conditions.....i.e.

#1/2N_2+3/2H_2(g) rarr NH_3(g)+DeltaH_"rxn"^@#

By definition, #DeltaH_"rxn"^@-=DeltaH_"formation"^@NH_3(g)#

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