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Show that the sum of mole fraction of a ...

Show that the sum of mole fraction of a solution is equal to one.

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Consider a solution containing two components A and B whose mole fractions are `x _(A) and x _(B)` respectively. Let the number of moles of two components A and B are `n_(A) and n_(B)` respectively.
`(n _(A))/(n _(A) + n _(B)), x _(B) = (n_(B))/(n _(A) + n _(B))`
` x _(A) + x _(B) = ( n _(A))/(n _(A) + n _(B)) + (n_(B))/( n _(A) + n _(B)) =1`
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