Question

The change in the Gibbs free energy for the vaporization of a pure substance is

• A. Positive
• B. Negative
• C. Zero
• D. May be positive or negative

Hint:

A negative change in Gibbs free energy indicates that a process is thermodynamically spontaneous. This is a key concept for phase transitions like vaporization.

Answer 1

The Correct Option is B

- For a pure substance undergoing vaporization, the change in Gibbs free energy is negative, indicating that the process is spontaneous under normal conditions. 
Conclusion: The change in Gibbs free energy for vaporization is negative, as given by option (B).