Vapour pressure of a solvent decreases by \( 1 \% \) on adding a non-volatile solute \( \mathrm{...

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Vapour pressure of a solvent decreases by \( 1 \% \) on adding a non-volatile solute \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) if it dissociates up to \( 25 \% \) then determine mole-fraction of solute, if solvent is 5 moles.
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