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  3. Chemistry
  4. What is the heat of formation of HCl ( g ) from reaction H 2( g )+ Cl 2( g ) arrow 2 HCl ( g ) . Δ H =44 kcal.

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Q. What is the heat of formation of $HCl ( g )$ from reaction $H _{2}( g )+ Cl _{2}( g ) \rightarrow 2 HCl ( g ) . \Delta H =44\, kcal$.

Thermodynamics

Solution:

The heat of formation of $HCl$ is to be calculated on per mole of $HCl$ produced.
$\therefore$ heat of formation of $HCl =-\frac{44}{2}=-22\,kcal$.