Question

Why elevation boiling point is directly proportional to molality

Answer 1

Because elevation in boiling point is a colligative property which depends on the number of moles of solute rather than their nature.

Answer 2

The elevation in boiling point is directly proportional to morality because:

• Elevation in boiling is an increase in the boring point of the substance when no volatile solute is added to a solvent.
• Due to this vapour pressure decreases.
• The formula for elevation in boiling point = ikbm.
• Here, i is vant's Hoff factor, kb is constant and m is molality.
• Elevation in boiling points depends on the amount of solute which is calculated as morality for a solution.
• Molality is used because it does not depend on temperature, unlike molarity.

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