Molarity 'M' = 2 M
Density 'd' = 1.02 g/mL
Molecular weight of solute 'MB' = 126 g/mol
Molality (m) = ?
2 M' means that 2 mol of solute is dissolved in 1 L solution.
Volume of solution = 1000 mL
Density of solution = 1.02 g/mL
Weight of solution = ?
So Weight of solution = Density × Volume
= 1.02 × 1000 = 1020 g
Moles of solute = \(\frac{\text{Weigh}
\ \text{of}\ \text{solute}\ (W_B) }{\text{Molecular} \ \text{weight}\ \text{of}\ \text{solute}\ (M_B)}\)
'WB' = Moles of solute × Molecular weight
= 2 × 126 = 252 g
Weight of solvent 'WA' = Weight of solution - Weight of solute
= 2.604 mol/kg.
