When and why is molality preferred over molarity in handling solution in CHMemistry?

Explanation

### Step-by-Step Solution:

1. **Define Molarity and Molality**:
- Molarity (M) is defined as the number of moles of solute per liter of solution. It is expressed as:
\[ \text{Molarity (M)} = \frac{\text{Number of moles of solute}}{\text{Volume of solution in liters}} \]
- Molality (m) is defined as the number of moles of solute per kilogram of solvent. It is expressed as:
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