42.2 g of KCl is dissolved in 368g of water. Calculate the molality of a solution.
To calculate the molality of a solution, we need to know the number of moles of solute and the mass of the solvent in kilograms.
The definition of molality (m) is
First, we find the number of moles of KCl in 42.2 g of KCl, using its molar mass as the conversion factor.
The mass of water is 368 g, or 0.368 kg. Therefore,