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 molality o

Question

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 molality o

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 molality of the solution is
A. `0.02`
B. `1.2`
C. `1.11`
D. `0.08`

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
`"Molality "(m)=(p_(@)-p_(s))/(p_(@))xx(1000)/(M)`
`"Molality "(m)=(25-24.5)/(25)xx(1000)/(18)=(0.5)/(25)xx(1000)/(18)=1.11`
`:."Molality of solution "=1.11m`

5 views Answered 2023-02-05 15:29