Write a general expression for the entropy change during a phase transformation, or Give a relation between entropy change and heat absorbed or evolved for a reversible reaction occuring at temperature T.

Explanation

To derive the general expression for the entropy change during a phase transformation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Phase Transformation**:
- A phase transformation occurs when a substance changes from one state of matter to another, such as solid to liquid (melting), liquid to gas (vaporization), or solid to gas (sublimation).

2. **Identify the Conditions**:
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