# Get help with Helmholtz free energy questions

Recent questions in Helmholtz Free Energy
Hailee Stout 2022-05-20 Answered

### Identify all the molecular modes of motion for water and without doing any calculation, write the expression for the related molecular partition function.

Bernard Mora 2022-05-19 Answered

### The first excited energy level of a hydrogen atom has an energy of 10.2 eV, if we take the ground-state energy to be zero. However, the first excited level is really four independent states, all with the same energy. We can therefore assign it an entropy of 8 = kIn 4, since for this given value of the energy, the multiplicity is 4. Question: For what temperatures is the Helmholtz free energy of a hydrogen atom in the first excited level positive, and for what temperatures is it negative?

Cesar Mcguire 2022-05-18 Answered

### Which among the following is the formula for Helmholtz free energy?a) U+TSb) U+TVc) U-TSd) UTV

Hailee Stout 2022-05-17 Answered

### Sometimes it is useful to know the free energy of a photon gas.Calculate the (Helmholtz) free energy directly from the definition F =U - TS. (Express the answer in terms of T and V.)

Jaeden Weaver 2022-05-17 Answered

### If the Helmholtz energy of a reaction is closed system is positive (at constant Volume and Temperature) what does this indicate about the corresponding change in total entropy of the system + surrounding?a) It is negativeb) It is positivec) It is equal to 0d) It depends on the value of the enthalpy of the reactione) None of the above

Autumn Pham 2022-05-14 Answered

### A mole of a van der Waals gas is expanded isothermally from ${V}_{1}$ to ${V}_{2}$. Derive the expressions for the changes in the Helmholtz free energy and internal energy.

Bernard Mora 2022-05-13 Answered

### Why might you expect the canonical partition function to scale exponentially with the system size, thus always ensuring that the Helmholtz free energy is extensive?

Carley Haley 2022-05-10 Answered

### Spin 1/2 particles in magnetic Field B can take energies $E=±{\mu }_{B}B$a) For N non interacting spin -1/2 particles at temperature T, derive the partition function Z and Helmholtz free energy F.b) Calculate the magnetic moment of this system, given by $m=-\left(\frac{\mathrm{\partial }F}{\mathrm{\partial }B}{\right)}_{T}$

Blaine Stein 2022-05-09 Answered

### Consider a volume V filled with N atoms of monatomic ideal gas.1. What is the Helmholtz energy of this system? (Be sure to substitute the form of any relevant partition function(s) from your formula sheet).2. Base don the Thermo dynamic square, what is there lation ship between Helmholtz energy and pressure. (Give a general thermodynamic expression not involving the par- tition function.)3. Combine your previous two answers to generate a simplified expression (involving no derivatives) for the pressure of the ideal monatomic gas

Jayden Mckay 2022-05-09 Answered

### Derive the following general equation,which is similar to the Gibbs-Helmholtz equation: $\left(\partial /\partial T\right)\left(F/T\right)=-U/{T}^{2}$

Cesar Mcguire 2022-05-09 Answered

### The Helmholtz free energy for a system of N harmonic oscillators

Yaritza Oneill 2022-05-09 Answered