1.48. What is the difference between molality and molarity?
1.48. What is the difference between molality and molarity?
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1 Answer
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1.48.
Molarity
Molality
The molarity of a given solution is defined as the total number of moles of solute per litre of solution.
Molality is defined as the total moles of a solute contained in a kilogram of a solvent.
The mathematical expression is-
M = number of moles of the solute /Volume of solution given in terms of litres.
M = (g ? 1000)/(W ? V).
The mathematical expression is-
m = Numbers of moles of solute/Mass of solvent in kgs
m = (g ? 1000)/(W ? m).
Depends on the volume of the whole solution.
Depends on the mass of the solvent.
Unit sign expressed as (M).
Unit sign expressed as (m).
Molarity has a unit of mol/litre.
Molality has units of mol/kg.
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