Home
Class 12
CHEMISTRY
A solution of a non-volatile solute in w...

A solution of a non-volatile solute in water freezes at `-0.30^(@)C`. The vapour pressure of pure water at `298 K` is `23.51 mm Hg` and `K_(f)` for water is `1.86 degree//molal`. Calculate the vapour pressure of this solution at `298 K`.

Text Solution

Verified by Experts

`DeltaT_(t)=K_(t)xx`molality
`rArr 0.3=1.86xx` Molality
`:.` Molality `=0.161`
Molality `=(X_(A)xx1000)/((1-X_(A))xxm_(2))` (mol wt of solvent. `=m_(2))`
`:.0.16=(X_(A)xx1000)/((1-X_(A))xx18)`
`:.X_(A)=0.00289`
`(P^(@)-P_(s))/(P^(@))=X_(A)`
`rArr (23.51-P_(s))/(23.51)=0.00289`
`:.P_(s)=23.442 mm`
Promotional Banner

Topper's Solved these Questions

  • LIQUID SOLUTION

    FIITJEE|Exercise SOLVED PROBLEMS (SUBJECTIVE)|17 Videos

  • LIQUID SOLUTION

    FIITJEE|Exercise SOLVED PROBLEMS (OBJECTIVE)|21 Videos

  • IONIC EQUILIBRIUM

    FIITJEE|Exercise SINGLE INTEGER ANSWER QUESTIONS|4 Videos

  • NUCLEIC ACID AND VITAMIN

    FIITJEE|Exercise ASSIGNMENT PROBLEMS (OBJECTIVE)|15 Videos

Similar Questions

Explore conceptually related problems

A solution of non-volite solute in water freezes at -0.80^(@)C .The vapour pressure of pure water at 298 K is 23.51 mm Hg .and K_(f) for water is 1.86 degree per molal. Calculate the vapour pressure of this solution at 298 K .

A solution of a non-volatile solute in water freezes at -0.40^(@)C . The vapour pressure of pure water at 298K is 23.51 torr. For water, K_(f)=1.86k mol^(-1)kg .Thus ,vapour pressure of the solution (in torr)

Vapour pressure of pure water at 298 K is 23.8 mm Hg . 50g of urea (NH_(2)CONH_(2)) is dissolved in 850g of water. Calculate the vapour pressure of water for this solution and its relative lowering.