JEE Main 2020 — Solutions Question with Solution
From: JEE Main 2020 (Online) 9th January Evening Slot
Question
A cylinder containing an ideal gas (0.1 mol of
1.0 dm3) is in thermal equilibrium with a large
volume of 0.5 molal aqueous solution of
ethylene glycol at its freezing point. If the
stoppers S1 and S2 (as shown in the figure) are
suddenly withdrawn, the volume of the gas in
litres after equilibrium is achieved will be____.
(Given, Kf (water) = 2.0 K kg mol–1,
R = 0.08 dm3 atm K–1 mol–1)
(Given, Kf (water) = 2.0 K kg mol–1,
R = 0.08 dm3 atm K–1 mol–1)
This question includes a diagram. The text above accompanies the figure.
Enter your answer
Show full solutionCorrect answer: 2.18
Correct answer
2.18
Step-by-step explanation
For aqueous solution
Tf = Kf.m = 2 × 0.5
Temperature of solution = –1°C = 272 K
Final volume of ideal gas =
=
= 2.18 L
Tf = Kf.m = 2 × 0.5
Temperature of solution = –1°C = 272 K
Final volume of ideal gas =
=
= 2.18 L
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