Question

A mass of 0.630 g of nacl is dissolved in 525 g of water. part a calculate the molality of the salt solution.

Answer 1

Molality is simply defined as the number of moles of solute over the mass of the solvent.

In this case the solute is NaCl and the solvent is water, therefore:

moles solute = 0.630g/ 58.44 g/mol = 0.0108 mol

So the molality is:

m = 0.0108 mol / (0.525 kg)

m = 0.0205 molal