Chemistry - Thermodynamics - I Question with Solution | TestHub
ChemistryThermodynamics - IHeat & Heat CapacityHard2 minQB
ChemistryHardnumerical
A lecture hall measures 6 m × 5 m × 4 m. Initially T = 300 K and P = 1.0×105 Pa. 40 people each give heat to the room at 125 W. The walls are perfectly insulating and absorb no heat, and no air leaks in or out. For air CP,m = 7R/2. How long (in s) until the air temperature reaches 310 K?
Answer:
200.00
Solution:
V = 120 m3 is fixed, so use CV = CP - R = 5R/2. Q = nCVΔ T = (PV)/(RT)×2.5R×10 = (2.5×105×120×10)/300 = 1.0×106 J. Power = 40×125 = 5000 W. t = 106/5000 = 200 s. Ans = 0200.
Stream:JEESubject:ChemistryTopic:Thermodynamics - ISubtopic:Heat & Heat Capacity
⏱ 2mℹ️ Source: QB
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