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Given ; 

    ∆rHθ = –92.4 kJ mol–1 

What is the standard enthalpy of formation of NH3 gas? 

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Standard enthalpy of formation of a compound is the change in enthalpy that takes place during the formation of 1 mole of a substance in its standard form from its constituent elements in their standard state. Re-writing the given equation for 1 mole of NH3(g), 3(g) 

= ½ ∆rHθ 

= ½ (–92.4 kJ mol–1

= –46.2 kJ mol–1

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