Mole fraction is useful in relating vapor pressure with the concentration of a solution.
According to Raoult’s law, the partial vapor pressure of each component in the solution is directly proportional to its mole fraction.
Thus, for a component C in a solution
Where PC is the partial pressure of component C and xc is a mole fraction of C in a solution.
Thus, option (i) is corerect and others are wrong.
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