(i)
| Molarity |
Molality |
| It is defined as the number of moles of the solute in 1 litter of the solution. |
It is defined as the number of moles of solute present in 1 kg of solvent. |
| It is affected by the change in temperature. |
It is not affected by the change in temperature. |
(ii) Molarity = 1.35 M
Mass of 1 L solution = 1.35 × 98
= 132.3 g
Mass of 1 L solution = 1000 × 1.02
= 1020 g (∵ Density = 1.02 g cm–3 )
Mass of water in solution = 1020 – 132.3
= 887.7 g = 0.888 kg
Molality = \(\frac{number\,of\,moles\,of\,solute}{Mass\,of\,solvent\,in\,kg}\) = \(\frac{1.35}{0.888}\) = 1.52 m
