Question

If the density of some lake water is 1.25 and contains 92 gm pf na+ions per kg of water. Calculate molality

Answer 1

Answer:

Let us find molality.Molality = Number of moles of solute / Mass of solvent in Kg.

Number of moles of solute  = Mass of glucose / Molar mass of glucose.

Molar mass of glucose Na + = 23  g /mol.

Number of moles 92 gm Na +==  92/23  = 4 moles.Molality  =4 M