The Vapour pressure of ethyl alcohol and methyl alcohol are 45 mm and 90mm. An ideal solution is formed at the same temperature by mixing 46g of C₂H₅OH with 40g of CH₃OH. Total vapour pressure of the solution is approximately x cm. x is __________.

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answer is 7.

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Detailed Solution

$\begin{array}{l} P = P_{A}^{0} X_{A} + P_{B}^{0} X_{B} = 45 \times \frac{4}{9} + 90 \times \frac{5}{9} = 70 mm \\ xcm = 70 mm = 7 cm \Rightarrow x = 7 \end{array}$

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