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The vapour pressure of ethyl alcohol at ...

The vapour pressure of ethyl alcohol at 298K is 40mm of Hg. Its mole fraction in a solution with methyl alcohol is 0.80. what is its vapoure pressure in solution. If the mixture obeys Raoult's law.

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Vapoure pressure of ethyl alcohol in solution=`P_(1)=?`
Vapour pressure of pure ethyl alcohol`=P^(@)=40` mm Hg
Mole fraction of ethyl alcohol`=x_(1)=0.8`
According to Raoult's law`=P_(1)=P_(1)^(0)xx x`
`P_(1)=40xx0.8=32` mm Hg.
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