1.

If at certain temperature the vapour pressure of pure water is 25 mm Hg and that of a very dilute aqueous urea solution is 24.5 mm Hg, the molarity of the solution is

Answer»

<P>`0.02`
`1.2`
`1.11`
`0.08`

Solution :`(P^(@)-P_(s))/(P^(@))=(w_(B))/(m_(B))xx(m_(A))/(w_(A)), (w_(B))/(w_(B)xx w_(A))xx1000xx(m)/(1000)`
`RARR (P^(@)-P_(s))/(P^(@))=" molality " xx(m)/(1000)`
`(25-24.5)/(25)=m xx(18)/(1000)`
`m=(0.02xx1000)/(18)=1.11`


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