how to calculate molality? Difference between Molarity and Molality?
Answers
The relationship between the molarity (M) and molality (m) is expressed as below. M = Molarity. m= Molality. M' = Molar mass of the solute.
Answer:
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.
Mathematical expression is M = number of moles of the solute /Volume of solution given in terms of litres.
Mathematical expression is
m = Numbers of moles of solute/Mass of solvent in kgs
m = (g ✕ 1000)/(W ✕ m).
Depends on 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 moles/liter.
Molality has units of moles/kg.
The relationship between the molarity (M) and molality (m) is expressed as below.
\(m= frac{1000times M}{1000times (d-M)times M^{‘}}\)
M = Molarity.
m= Molality.
M’ = Molar mass of the solute.