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Question

Sea water contains $29.25 \% ~\mathrm{NaCl}$ and $19 \% ~\mathrm{MgCl}_{2}$ by weight of solution. The normal boiling point of the sea water is _____________ ${ }^{\circ} \mathrm{C}$ (Nearest integer)

Assume $100 \%$ ionization for both $\mathrm{NaCl}$ and $\mathrm{MgCl}_{2}$

Given : $\mathrm{K}_{\mathrm{b}}\left(\mathrm{H}_{2} \mathrm{O}\right)=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$

Molar mass of $\mathrm{NaCl}$ and $\mathrm{MgCl}_{2}$ is 58.5 and 95 $\mathrm{g} \mathrm{~mol}^{-1}$ respectively.

Correct Answer
116

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