1. True or False: The solid-gas and solid-liquid coexistence lines always have p

Question

1. True or False: The solid-gas and solid-liquid coexistence lines always have positive slopes in the phase diagram of a pure substance.

2. True or False: The molar Gibbs free energy of a pure solid will increase less as pressure increases than would the molar Gibbs free energy of a perfect gas.

3. True or False: Partial molar volumes must always be positive.

4. True or False: If the entropy of mixing in a real solution is positive, then its excess entropy is also positive.

5. True or False: The entropy of mixing perfect gases is always positive.

6. True or False: The chemical potential of pure liquid water at standard conditions is higher than the standard chemical potential of liquid water in an aqueous solution

Explanation / Answer

1. The solid-gas and solid-liquid coexistence lines always have positive slopes in the phase diagram of a pure substance : True

2. The molar Gibbs free energy of a pure solid will increase less as pressure increases than would the molar Gibbs free energy of a perfect gas : True

3. Partial molar volumes must always be positive : False

4. If the entropy of mixing in a real solution is positive, then its excess entropy is also positive : True

5. The entropy of mixing perfect gases is always positive : True

6. The chemical potential of pure liquid water at standard conditions is higher than the standard chemical potential of liquid water in an aqueous solution : True

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