First slide
Fundamentals of thermodynamics
Question

The second law of thermodynamics is a fundamental law of science. In this problem, we consider the thermodynamics of an ideal gas, phase transition, and chemical equilibrium. Three moles of CO2 gas expands isothermally (in thermal contact with the surroundings; temperature = 15.0°C) against volume fixed external pressure of 1.00 bar. The initial and final volume of the gas are 10.0 L and 30.0 L, respectively.

Moderate
Question

Select the correct order of the entropy change. 

Solution

 In expansion of CO, gas molecule, entropy of system Δsys S increases or Δsys S>0 and entropy of surrounding decreases  Δsurr S<0.

 

Question

Assuming CO2 to be an ideal gas, sys S is 

Solution

 - Work done =q=nRT lnV2V1

=3×8.314×288.15×ln3010

ΔS=qT

 or Δsys S=3×8.314×288.15×ln3010288.15=27.4JK1

Question

Δsurr S is 

Solution

.entropy of surroundings should be less than zero

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