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A solution containing \mathrm{2 g} of a non-volatile solute in \mathrm{20 g} of water boils at \mathrm{373.52 K}. The molecular mass of the solute is___________ \mathrm{g mol^{-}1.} (Nearest integer)
Given, water boils at \mathrm{373.52 K}, \mathrm{K_{b}} for water \mathrm{= 0.52\: K \: kg\: mol^{-1}}

Option: 1

100


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\begin{aligned} & \Delta \mathrm{T}_{\mathrm{b}}=373.52-373=0.52 \\ & \Delta \mathrm{T}_{\mathrm{b}}=\mathrm{i} \mathrm{Kbm}_{\mathrm{b}} \quad \mathrm{i}=1 \\ & 0.52=0.52 \times \frac{2 / \mathrm{x}}{20} \times 1000 \\ & \mathrm{x}=100 \mathrm{gm} / \mathrm{mol} \end{aligned}

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