As a 1-gram sample of H2O(1) changes to H2O(g)
at 100°C, the potential energy of the molecules
A. decreases
B.
increases
C. remains the same

Changing of a substance from liquid to a gas, is known as vaporization. During vaporization a substance absorbs thermal energy. The forces between particle is very weak and hence they gain potential energy. Thus, while changing from liquid to gas, energy gets absorbed to increase the potential energy. This energy is known as latent heat of vaporization.

Hence, option B is correct

As a 1-gram sample of H2O(1) changes to H2O(g) at 100°C, the potential energy of the molecules A. decreases B. increases C. remains the same

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As a 1-gram sample of H2O(1) changes to H2O(g)
at 100°C, the potential energy of the molecules
A. decreases
B.
increases
C. remains the same