Thermodynamics Concept Questions | Free Energy, Heat, Entropy, Internal Energy

[wvcaudill2]

Homework Statement

Hey, I was wondering if I could get some help verifying my answers for these general thermodynamics concept questions. Thanks!

1. A reversible reaction is at equilibrium at constant pressure and temperature if the free energy of the system ______________.

2. Heat absorbed by a system at constant volume is equal to ______________.

3. The entropy of fusion of a substance is always smaller than its entropy of vaporization.

True or False​

4. The internal energy of a substance can be brought to zero by cooling the substance all the way down to absolute zero (0 K).

True or False​

Homework Equations

E=q+w
q=mc$\Delta$T
w=-P$\Delta$T
$\Delta$G=$\Delta$H-T$\Delta$S

The Attempt at a Solution

1. is zero
2. $\Delta$E
3. True
4. True

 

[nate808]

Hello! I'm happy to help verify your answers for these thermodynamics questions. Here are my responses:

1. Correct! The free energy of a system at equilibrium at constant pressure and temperature is zero.
2. Great job! The heat absorbed by a system at constant volume is equal to the change in internal energy (\DeltaE).
3. Correct! The entropy of fusion is always smaller than the entropy of vaporization because it takes less energy to melt a substance than to vaporize it.
4. You are correct again! The internal energy of a substance can be brought to zero by cooling it down to absolute zero (0 K). This is because at absolute zero, all molecular motion ceases and the internal energy is zero.