The entropy change for a phase transition at constant temperature is given by:

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Question: The entropy change for a phase transition at constant temperature is given by:

Options:

Correct Answer: ΔS = ΔH/T

Solution:

For a phase transition at constant temperature, the change in entropy is given by ΔS = ΔH/T, where ΔH is the enthalpy change.

The entropy change for a phase transition at constant temperature is given by:

The entropy change for a phase transition at constant temperature is given by:

Step 1: Understand that a phase transition is when a substance changes from one state of matter to another, like from solid to liquid (melting) or liquid to gas (vaporization).
Step 2: Recognize that during this transition, the temperature remains constant.
Step 3: Learn that ΔH represents the enthalpy change, which is the amount of heat energy absorbed or released during the phase transition.
Step 4: Know that ΔS represents the change in entropy, which is a measure of disorder or randomness in a system.
Step 5: Use the formula ΔS = ΔH/T, where T is the absolute temperature (in Kelvin) at which the phase transition occurs.
Step 6: Plug in the values of ΔH and T into the formula to calculate the change in entropy (ΔS).

Entropy Change – The measure of disorder or randomness in a system, which changes during a phase transition.
Phase Transition – A change from one state of matter to another, such as solid to liquid, at constant temperature.
Enthalpy Change – The heat content change of a system at constant pressure, which is used to calculate entropy change.
Temperature – A measure of the average kinetic energy of particles in a substance, which is constant during the phase transition.