Question -
Answer -
Standard enthalpy offormation of a compound is the change in enthalpy that takes place during theformation of 1 mole of a substance in its standard form from its constituentelements in their standard state.
Re-writing the given equation for 1 mole ofNH3(g),
Standard enthalpy of formation of NH3(g)
= ┬╜ ╬ФrH╬╕
= ┬╜ (тАУ92.4 kJ molтАУ1)
=тАУ46.2 kJ molтАУ1