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How can a reaction with a negative value of ▲ Gº be described?OA. As exothermicOB. As spontaneousOC. As endothermicOD. As nonspontaneous

Sagot :

Answer: A negative value of ΔG describes a spontaneous reaction (letter B).

Explanation:

The question requires us to choose the correct option that describes a reaction with negative value of free energy change (ΔG).

Free energy (G) refers to the energy that is available to a system to do work. It refers to the spontainety of a chemical reaction rather than the heat energy that is released or absorbed by the system as the reaction occurs.

As the spontainety of a reaction is determined by the enthalpy and entropy changes (ΔH and ΔS, respectively) that occur in the system, free energy change (ΔG) can be defined in terms of ΔH and ΔS:

[tex]ΔG^°=ΔH^°-TΔS^°[/tex]

A spontaneous chemical reaction is one that releases energy, thus the reaction will be spontaneous when ΔG value is negative.

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