JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
Mass of Urea \(\left( NH _2 CONH _2\right)\) required to be dissolved in \(1000 g\) of water to reduce the vapour pressure of water by \(25 \%\) is \(......g\). (Nearest integer) Given: Molar mass of \(N,C,O\) and \(H\) are \(14,12,16\) and \(12\,mol ^{-1}\) respectively.
- A \(1112\)
- B \(1113\)
- C \(1114\)
- D \(1111\)
Answer & Solution
Correct Answer
(D) \(1111\)
Step-by-step Solution
Detailed explanation
\(\frac{ P ^0- P _{ s }}{ P _{ s }}=\frac{ n _{\text {solute }}}{ n _{\text {solvent }}}=\frac{\frac{ x }{60}}{\frac{1000}{18}}=\frac{ P ^0-0.75 P ^0}{0.75 P ^0}\) \(\Rightarrow x =\frac{10000}{9}=1111\,gm\)
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