The degree of dissociation of \( \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} \) in a dilute aque...

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The degree of dissociation of \( \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} \) in a dilute aqueous solution containing 7 gm of the salt per \( 100 \mathrm{gm} \) of water at \( 100^{\circ} \mathrm{C} \) is \( 70 \% \). If the vapour pressure of water at \( 100^{\circ} \mathrm{C} \) is \( 760 \mathrm{~mm} \). Calculate the
\( P \) vapour pressure of the solution.

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