Question

What determines whether or not a reaction is spontaneous?

Answer 1

The two factors that determine whether a reaction is spontaneous are:

Enthalpy: When the reaction gives off energy, then the reaction is said to be spontaneous.

Entropy: It is the measure of randomness in a system. As the randomness of the reaction increases, the spontaneous is the reaction.

That's it

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Answer 2

Enthalpy: When the reaction gives off energy, then the reaction is said to be spontaneous. Entropy: It is the measure of randomness in a system.