State the second law of thermodynamics. Predict the sign of `DeltaS` in the following change at constant temperature and pressure. Give reason in support of your answer.
`CaCO_3(s) to CaO(s) + CO_2(g)`

Explanation

### Step-by-Step Solution:

1. **State the Second Law of Thermodynamics**:
The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time. It either increases or remains constant. This implies that natural processes tend to move towards a state of greater disorder or randomness.

2. **Identify the Reaction**:
The reaction given is:
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...