Chemistry - Thermodynamics - II Question with Solution | TestHub
ChemistryThermodynamics - IICalculation of DSMedium2 minQB
ChemistryMediumsingle choice
Molar heat capacity of CD2O (deuterated form of formaldehyde) vapour at constant pressure is 14 cal/K-mol. The entropy change associated with the cooling of 3.2 g of CD2O vapour from 1000 K to 900 K at constant pressure is (assume ideal gas behaviour for CD2O) [ln 0.9 = -0.1]
Options:
Answer:
B
Solution:
Molar mass of CD2O = 12 + 2(2) + 16 = 32 g/mol, so n = 3.2/32 = 0.1 mol. Δ S = nCPln(T2/T1) = 0.1 × 14 × ln 0.9 = 0.1 × 14 × (-0.1) = -0.14 cal/K. Matches (b).
Stream:JEESubject:ChemistryTopic:Thermodynamics - IISubtopic:Calculation of DS
⏱ 2mℹ️ Source: QB
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