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Enthalpy of formation of HF and HCl are -161kj and -92kj respectively, which one is a more stable compound and why

Asked by anirbanbag81 14th December 2017, 11:30 AM
Answered by Expert
HF is more stable than HCl.
More the enthalpy of formation less will be the stability.

Heat of formation may be positive or negative.

If ΔH is positive it is exothermic.

If ΔH is negative it is endothermic.

Stability of exothermic compound is more than that of endothermic compound, therefore greater the liberated energy greater is the stability.

Here, Enthalpy of formation of HF is -161kj and HCl is -92kj

 Hence, HF is more stable than HCl.

Answered by Expert 18th December 2017, 5:55 PM
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