Verified Solution • 2025–26 Session moderate

QJEEM19Chcb3b: JEE Main 2019 Chemistry - Class 11 JEEM19Chcb3b Solution: The entropy change associated with the conversion of 1 kg of…

The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is :

(Specific heat of water liquid and water vapour are 4.2 kJ K−1 kg−1 and 2.0 kJ K−1 kg−1; heat of liquid fusion and vapourisation of water are 334 kJ−1 and 2491 kJ kg−1, respectively). (log 273 = 2.436, log 373 = 2.572, log 383 = 2.583)

Multiple Choice Options

  • A 7.90 kJ kg−1 K−1
  • B 2.64 kJ kg−1 K−1
  • C 8.49 kJ kg−1 K−1
  • D 9.26 kJ kg−1 K−1

Step-by-Step Verified Solution

JEE Main 2019 (Online) 9th January Evening Slot Chemistry - Thermodynamics Question 146 English Explanation
ΔS1=ΔHfusion273=334273=1.22

ΔS2=4.2ℓN(363273)=1.31

ΔS3=ΔHvap373=2491373=6.67

ΔS4=2.0ℓn(383373)=0.05

ΔStotal=9.26 kJ Kg−1 K−1

Related Learning Resources & Exam Preparation

JEE Main PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring