What is the significance of the Gibbs Free Energy of formation (ΔGf°)?

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Question: What is the significance of the Gibbs Free Energy of formation (ΔGf°)?

Options:

Correct Answer: It is the energy required to form a compound from its elements.

Solution:

ΔGf° indicates the energy change when a compound is formed from its elements in their standard states.

What is the significance of the Gibbs Free Energy of formation (ΔGf°)?

What is the significance of the Gibbs Free Energy of formation (ΔGf°)?

Step 1: Understand that Gibbs Free Energy (ΔG) is a measure of energy available to do work in a system.
Step 2: Know that ΔGf° specifically refers to the Gibbs Free Energy change when a compound is formed from its elements.
Step 3: Recognize that 'standard states' means the elements are in their most stable form at 1 atmosphere of pressure and a specified temperature (usually 25°C).
Step 4: Realize that a negative ΔGf° value indicates that the formation of the compound is spontaneous and releases energy.
Step 5: Understand that a positive ΔGf° value means that forming the compound requires energy input and is not spontaneous.

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