Answer:
Mass = 239.62 g
Explanation:
Molality is given as,
m = Moles of Solute / Kg of Solvent --- (1)
Data Given;
Molality = 1.5 m
Mass of Solvent = 750 g = 0.75 Kg
Solving eq. 1 for Moles,
Moles = Molality × Mass of Solvent
Putting values,
Moles = 1.5 mol.Kg⁻¹ × 0.75 Kg
Moles = 1.125 mol
Calculating mass from moles,
Moles = Mass / M.mass
Or,
Mass = Moles × M.mass
Putting values,
Mass = 1.125 mol × 213 g.mol⁻¹
Mass = 239.62 g
