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  • The wt. of solute M=80 required to be added in 200 g of water to reduce the vapour pressure <img alt="\frac{4}{5}^{\text{th}}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cfrac

The wt. of solute M=80 required to be added in 200 g of water to reduce the vapour pressure \frac{4}{5}^{\text{th}}of pure water is

Option: 1

310.5


Option: 2

112.8


Option: 3

222.2


Option: 4

448.6


Answers (1)

\begin{aligned} & \mathrm{\frac{P^0-P_s}{P_s}=\frac{w_1\times \text{m}_2}{\text{m}_1 \times w_2} }\\ \\&\mathrm{ \frac{P^0-\frac{4}{5} P^0}{\frac{4 }{5}P^0}=\frac{w_1 \times 18}{80 \times 200}} \\ \\& \mathrm{w_1=\frac{80 \times 200}{4 \times 18}=222.2} \end{aligned}

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Sumit Saini

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