1. Show how the second law of thermodynamics is used to show that the dropping of a weight is spontaneous and irreversible process.

2. Show how the second law of thermodynamics is used to show that the transfer of heat from a hot to a cold object is spontaneous and irreversible process.

3. Show how the second law of thermodynamics is used to show that an exothermic reaction like 2H₂ + O₂ = 2H₂O is spontaneous and irreversible process.

4. Which would have the highest entropy?

C(diamond) or C(graphite)

H₂O(g) or H₂O(l)

N₂(g) or NO₂(g)

Look up the actual values of S for each of these substances in the back of the book and verify your answers.

5. Predict the sign of the change in entropy for each of these reactions and then calculate it from the data in the appendix.

a) 2H₂ + O₂ = 2H₂O

b) C(s) + O₂(g) = CO₂(g)

c) Br₂(l) = Br₂(g)