Chemistry - Thermodynamics - II Question with Solution | TestHub
ChemistryThermodynamics - IICalculation of DSEasy2 minQB
ChemistryEasysingle choice
A 1 kg piece of an alloy at 600 K is placed in 3 kg of water at 300 K. If the specific heat capacity of water is 1.0 cal/K-g and that of the alloy is 1.0 cal/K-g, the entropy change of the system is (ln 2 = 0.7, ln 5 = 1.6)
Options:
Answer:
A
Solution:
Heat capacities: alloy 1000 cal/K, water 3000 cal/K. Tf = (1000 × 600 + 3000 × 300)/4000 = 375 K. ΔS = 1000 ln(375/600) + 3000 ln(375/300) = 1000 ln(5/8) + 3000 ln(5/4) = 1000(1.6 − 2.1) + 3000(1.6 − 1.4) = −500 + 600 = +100 cal/K = +0.1 kcal/K. Matches (a).
Stream:JEESubject:ChemistryTopic:Thermodynamics - IISubtopic:Calculation of DS
⏱ 2mℹ️ Source: QB
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