Question
Define molality and mole fraction.
Solution
Molality. It is defined as the number of moles of the solute dissolved in 1kg (or 1000g) of the solvent.

Mole fraction. Mole fraction may be defined as the ratio of the number of moles of one component to the total number of moles of all the components present in the solution.
For a binary solution made up of components A and B,

Sum of the mole fractions

Mole fraction. Mole fraction may be defined as the ratio of the number of moles of one component to the total number of moles of all the components present in the solution.
For a binary solution made up of components A and B,

Sum of the mole fractions

