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Benzene and toluene form a nearly ideal ...

Benzene and toluene form a nearly ideal solution. At a certain temperature, calculate the vapour pressure of solution containing equal moles of two substances `("Given ",p_("toluene")^0=55mm" "Hg,p_("benzene")^0=150mm" "Hg]`

Text Solution

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As the number of moles of toluene and benzene are equal, `x_("toluene"),x_("benzene")=0.5`
`:.` According to Raoult's law, the vapour pressure of the solution, `P=x_("toluene")*P_("toluene")^0+x_("benzene")*P_("benzene")^0`
`=(0.5xx55+0.5xx150)mm" "Hg`
`=(27.5+75)mm" "Hg=102.5mm" "Hg`
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