Question 83 of 84
Q.Define
(i) Molality
(ii) Normality.
Puducherry TnboardTamil Nadu HSC First Year (DGE) Board 2026Subjective· 3mImportance★★★★★est
99% · 83/84 Questions
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Start your 14-day free trial to unlock the full solution →We are asked to define molality and normality.
Molality = moles of solute per kg of solvent; Normality = gram-equivalents of solute per litre of solution.
- Molality (m): It is defined as the number of moles of solute dissolved in 1 kilogram (1000 g) of the solvent. Molality (m) = (moles of solute) / (mass of solvent in kg) Its unit is mol kg^-1 (molal). Since it is based on the mass of the solvent (not volume), molality does not change with temperature.
- Normality (N): It is defined as the number of gram-equivalents of solute dissolved in 1 litre (1000 mL) of solution. Normality (N) = (number of gram-equivalents of solute) / (volume of solution in litres) …
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