Molality (m) is the moles of solute dissolved per kilogram of solvent. Molality is calculated by dividing the number of moles of solute by the number of kilograms of solvent. Molality offers an advantage over molarity because it is based on solvent weight and avoids problems associated with volume expansion or contraction owing to the addition of solutes or from a change in temperature.
Molality (mA) = moles of solute (nA) ÷ kilogram of solvent (kg)
Mole fraction (X) is the ratio of the number of moles of one component to the total moles of a mixture or solution.
Mole Fraction (XA) = nA ÷ (nA, nB, nC . . .)
Where, XA + XB + XC . . . = 1
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