Chemistry - Thermodynamics - I Question with Solution | TestHub
ChemistryThermodynamics - IAdiabatic Process/PolytropicHard2 minQB
ChemistryHardmultiple choice
Three moles of an ideal monoatomic gas expand adiabatically and reversibly, and the temperature falls from 127°C to 27°C. (R = 2 cal/K-mol.) Which of the following is/are true?
Options:(select one or more)
Answer:
B, C, D
Solution:
Δ T = -100 K, Cv = 3 cal/K-mol, Cp = 5 cal/K-mol. Δ U = 3 × 3 × (-100) = -900 cal, so (a) is false. q = 0, so wby = 900 cal: (b) true. Δ H = 3 × 5 × (-100) = -1500 cal: (c) true. For a reversible adiabat P2/P1 = (T2/T1)γ/(γ-1) = (300/400)2.5 = 0.487 < 0.5: (d) true. Ans: (b), (c), (d).
Stream:JEESubject:ChemistryTopic:Thermodynamics - ISubtopic:Adiabatic Process/Polytropic
⏱ 2mℹ️ Source: QB
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