Predict the sign of entropy change for each of the following changes of state.

Options

A. `Hg(l) rarr Hg(g)`
B. `AgNO_(3)(s) rarr AgNO_(3)(aq)`
C. `I_(2)(g) rarr I_(2)(s)`
D. `C("graphite") rarr C("diamond")`

Explanation

To predict the sign of entropy change (ΔS) for the given changes of state, we will analyze each case based on the level of disorder or randomness associated with the states involved.

### Step-by-Step Solution:

1. **Change A: Liquid Mercury (Hg) to Gaseous Mercury (Hg)**
- **Analysis**: When a substance transitions from a liquid state to a gaseous state, the molecules have more freedom to move and occupy a larger volume. This increase in molecular movement and space leads to greater disorder.
- **Conclusion**: Since the disorder increases, the entropy change (ΔS) is **positive**.

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