Question
Define the term : Mole fraction

Answer

Mole fraction (x) : The mole fraction of an element present in a mixture is the ratio of the mole of that element to the total moles of all the elements present in the mixture.
Mole fraction of any component in the mixture 
$=\frac{\text { Number of moles of the component }}{\text { Total number of moles of all the component }}$

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