CUET · CHEMISTRY · PYQ PAPER 2025
Calculate the lowering of vapour pressure caused by the addition of \(5 0 ~ g\) of sucrose (mol mass = \(3 4 2 ~ g / m o l\) ) to \(7 5 0 ~ g\) of water, if the vapour pressure of pure water at Ambient temperature is 23.8 mm Hg
- A 0.083 mm Hg
- B 0.008 mm Hg
- C 0.045 mm Hg
- D 0.012 mm Hg
Answer & Solution
Correct Answer
(A) 0.083 mm Hg
Step-by-step Solution
Detailed explanation
\(n_{sucrose} = \frac{50}{342} = 0.146 \, mol\) \(n_{water} = \frac{750}{18} = 41.667 \, mol\) \(\Delta P = P^0 \times X_{sucrose} = P^0 \times \frac{n_{sucrose}}{n_{sucrose} + n_{water}}\)…
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