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# Define Mole fraction - CBSE (Science) Class 12 - Chemistry

ConceptExpressing Concentration of Solutions

#### Question

Define Mole fraction

#### Solution

Mole fraction:

The mole fraction of a component in a mixture is defined as the ratio of the number of moles of the component to the total number of moles of all the components in the mixture.

i.e.

Mole fraction of a component  = ("Number of moles of the component")/("Total number of moles of all component")

Mole fraction is denoted by ‘x’.

If in a binary solution, the number of moles of the solute and the solvent are nA and nB respectively, then the mole fraction of the solute in the solution is given by,

x_A = n_A/(n_A+n_B)

Similary the mole fraction of the solvent in the solution is given

x_B = n_B/(n_A+n_B)

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Solution Define Mole fraction Concept: Expressing Concentration of Solutions.
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