What is the relationship between enthalpy change and the spontaneity of a reacti

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Question: What is the relationship between enthalpy change and the spontaneity of a reaction?

Options:

Correct Answer: Spontaneity depends on enthalpy and entropy changes

Solution:

Spontaneity is determined by both enthalpy and entropy changes, as described by the Gibbs free energy equation.

What is the relationship between enthalpy change and the spontaneity of a reaction?

What is the relationship between enthalpy change and the spontaneity of a reaction?

Step 1: Understand that spontaneity means whether a reaction will happen on its own without outside help.
Step 2: Learn about enthalpy, which is the heat content of a system. A reaction can release heat (exothermic) or absorb heat (endothermic).
Step 3: Know that a negative enthalpy change (heat released) often favors spontaneity.
Step 4: Understand that entropy is a measure of disorder or randomness in a system. A positive entropy change (more disorder) also favors spontaneity.
Step 5: Learn about the Gibbs free energy equation: ΔG = ΔH - TΔS, where ΔG is the change in Gibbs free energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.
Step 6: Realize that if ΔG is negative, the reaction is spontaneous. This means that both ΔH and ΔS play a role in determining spontaneity.

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