Thermodynamics

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Question

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Question 1 : Third law of thermodynamics provides a method to evaluate which property?
1. Absolute Energy
2. Absolute Entropy
3. Absolute Enthalpy
4. Absolute Free Energy
Answer
8516

Question 2 : One mole of which of the following has the highest entropy?
1. Mercury
2. Diamond
3. Liquid Nitrogen
4. Hydrogen Gas
Answer
8517

Question 3 :

The enthalpy of vaporisation of a substance is 8400 J mol^-1 and its boiling point is –173°C. The entropy change for vaporisation is ___________

1. 84 J mol^-1K^-1
2. 21 J mol^-1K^-1
3. 49 J mol^-1K^-1
4. 12 J mol^-1K^-1
Answer
8518

Question 4 :

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is ___________

1. CH₄(g)
2. H₂O(g)
3. Br₂(g)
4. Cl₂(g)
Answer
8519

Question 5 :

In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?

1. 250 kJ
2. 350 kJ
3. 600 kJ
4. 850 kJ
Answer
8520