Chemistry - Thermodynamics - I Question with Solution | TestHub
ChemistryThermodynamics - IFirst law of ThermodynamicsMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
An amount of 4 mole of hydrogen gas is taken in a vessel at STP and the vessel is sealed. Now the gas is cooled to -50°C.
What is the change in internal energy of gas?
Options:
Answer:
C
Solution:
The vessel is sealed, so V is constant. STP is 273 K, so Δ T = 223 - 273 = -50 K. H2 is diatomic: Cv,m = 5/2R = 5 cal/mol K (R = 2 cal/mol K). Δ U = nCv,mΔ T = 4 × 5 × (-50) = -1000 cal (≈ -4.16 kJ). Matches (c).
Stream:JEESubject:ChemistryTopic:Thermodynamics - ISubtopic:First law of Thermodynamics
⏱ 2mℹ️ Source: QB
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