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PART - 1 CH - 1 Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 1 Some Basic Concepts of Chemistry2 Marks
Question
What is mole fraction? How it is calculated?
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Answer

The mole fraction of a component in a mixture or solution is the ratio of number of moles of that component to the total moles of the mixture. If solute $A$ is dissolved in solvent $B$ whose moles are $n_A$ and $n_B$ respectively.
Mole fraction of $A \left( X _{ A }\right)=\frac{\text { Moles of } A }{\text { Total moles of solution }}$
Mole fraction of $B \left( X _{ B }\right)=\frac{\text { Moles of } B }{\text { Total moles of solution }}$
The total mole fraction of all constituent of any mixture is always one.
$
X_{A}+X_{B}=1
$

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