Answer:
0.4383 g
Explanation:
Molality is defined as the moles of the solute present in 1 kg of the solvent.
It is represented by 'm'.
Thus,
[tex]Molality\ (m)=\frac {Moles\ of\ the\ solute}{Mass\ of\ the\ solvent\ (kg)}[/tex]
Given that:
Mass of solvent, water = 150 g = 0.15 kg ( 1 g = 0.001 g )
Molality = 0.050 m
So,
[tex]0.050=\frac {Moles\ of\ the\ solute}{0.15}[/tex]
[tex]Moles = 0.050\times 0.15\ mol= 0.0075\ mol[/tex]
Molar mass of NaCl = 58.44 g/mol
Mass = Moles*Molar mass = [tex]0.0075\times 58.44\ g[/tex] = 0.4383 g
