Q.

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

P=PA0XA+PB0XB=45×49+90×59=70mmxcm=70mm=7cmx=7

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