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The molal elevation constant is the rati...

The molal elevation constant is the ratio of the elevation in boiling point to :

A

Molarity

B

Molality

C

Mole fraction of solute

D

Mole fraction of solvent

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The correct Answer is:
To solve the question regarding the relationship of the molal elevation constant, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Concept of Elevation in Boiling Point**: - When a non-volatile solute is dissolved in a solvent, the boiling point of the solution increases compared to the pure solvent. This phenomenon is known as boiling point elevation. 2. **Identify the Formula for Elevation in Boiling Point**: - The elevation in boiling point (\( \Delta T_b \)) can be expressed with the formula: \[ \Delta T_b = i \cdot K_b \cdot m \] - Here, \( \Delta T_b \) is the elevation in boiling point, \( K_b \) is the molal elevation constant, \( m \) is the molality of the solution, and \( i \) is the van 't Hoff factor (which is 1 for non-electrolytes). 3. **Rearranging the Formula**: - To find the molal elevation constant \( K_b \), we can rearrange the formula: \[ K_b = \frac{\Delta T_b}{m} \] - This shows that the molal elevation constant is the ratio of the elevation in boiling point to the molality of the solution. 4. **Conclusion**: - Therefore, the molal elevation constant \( K_b \) is the ratio of the elevation in boiling point (\( \Delta T_b \)) to the molality (\( m \)) of the solution. ### Final Answer: The molal elevation constant is the ratio of the elevation in boiling point to the molality of the solution. ---
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