How does enthalpy affect the spontaneity of a reaction?

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How does enthalpy affect the spontaneity of a reaction?

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Answer 1 · 2015-10-03T08:17:24

$Δ G = Δ H - T Δ S$ $DeltaG=DeltaH - TDeltaS$

Explanation:

Spontaneity is governed by free energy $Δ G$ $DeltaG$ . The relationship between the change on free energy $Δ G$ $DeltaG$ and change on enthalpy $Δ H$ $DeltaH$ is:

$Δ G = Δ H - T Δ S$ $DeltaG=DeltaH - TDeltaS$
where $Δ S$ $DeltaS$ is the change on entropy.

For spontaneous processes, $Δ G$ $DeltaG$ has to be negative. In order to predict the sign of $Δ G$ $DeltaG$ , we will need to watch for the sign of $Δ H$ $DeltaH$ and the term $T Δ S$ $TDeltaS$ . Here is a table that explains this:

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How does enthalpy affect the spontaneity of a reaction?

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