What is the entropy change for a reversible isothermal process?

What is the entropy change for a reversible isothermal process?

Step 1: Understand what entropy (S) is. Entropy is a measure of disorder or randomness in a system.
Step 2: Know that a reversible isothermal process means the temperature (T) remains constant while the system changes.
Step 3: Identify the variables: n is the number of moles of gas, R is the ideal gas constant, Vf is the final volume, and Vi is the initial volume.
Step 4: Recall the formula for entropy change (ΔS) in a reversible isothermal process: ΔS = nR ln(Vf/Vi).
Step 5: Recognize that ln is the natural logarithm, which is a mathematical function.
Step 6: To find the entropy change, plug in the values for n, R, Vf, and Vi into the formula.

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