1.

Vapour pressure of chloriform (CHCI_(3)) and dichloromethane (CH_(2)CI_(2)) at 25^(@)C are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of solution obtained bu mixing 25.5 g of CHCI_(3) and 40.0g of CH_(2)CI_(2) at the same temperature will be (Mlecular mass of CHCI_(3)=1199.5 u and molecular mass of CH_(2)CI_(2)=85u

Answer»

<P>173.9 mm Hg
615.0 mm Hg
347.9 mm Hg
90.63 mm of Hg

Solution :`P_(CHCI_(3))^(@)=200 mm Hg. P_(CH_(2)CI_(2))^(@)=41.5 mm Hg`
Moles of `CHCI_(3)`
`("Mass")/("Molecular weight")=((25.5g))/((119.5g mol^(-1)))=0.213 mol`
Moles of `CH_(2)CI_(2)=((40g))/((85gmol^(-1)))=0.470 mol`
`X_(CHCI_(3))=((0.213))/((0.213+0.470))=0.31`
`X_(CH_(2)CI_(2))=(0.470)/(0.213+0.470)=0.69`
`P_(T)=P_(CHCI_(3))^(@)X_(CHCI_(3))+P_(CH_(2)CI_(2))^(@)X_(CH_(2)CI_(2))`
=`200xx0.31+41.5xx0.69
=62+28.63=90.63 mm of Hg


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