Chemistry - Ideal Gas Question with Solution | TestHub
ChemistryIdeal GasVapour PressureMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
A quantity of 5.0 kg liquid water is poured in an evacuated room of capacity 40 m3 maintained at 300 K. Assume ideal gas behaviour for water vapour. The vapour pressure of water at 300 K is 0.04 atm. (R = 0.08 l-atm/K-mol)
What percentage of liquid water will vaporize?
Options:
Answer:
B
Solution:
Vapour needed to saturate the room: n = PV/RT = 0.04 × 40000/(0.08 × 300) = 66.67 mol = 66.67 × 18 = 1.2 kg. Percentage vaporized = 1.2/5.0 × 100 = 24%. Hence (b).
Stream:JEESubject:ChemistryTopic:Ideal GasSubtopic:Vapour Pressure
⏱ 2mℹ️ Source: QB
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