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Helmholtz Free Energy

Recent questions in Helmholtz Free Energy

Hailee Stout 2022-05-17

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

Rank the entropies of the following materials in an increasing order liquid Ag at 2435K, vapor Ag at 2435 K, solid Ag at 0K, solid Ag at 298 K, solid Ag 1234 K, and liquid Ag at 1234 K.

Thaddeus Sanders 2022-05-15

Calculate the entropy for 2.3 moles of neon gas at T= 289 K and p = 0.8 atm. State your answer in J K as a number in normal form accurate to 1 decimal place (X.X or XX.X, etc.). Do not include units in your answer. Calculate the Helmholtz free energy for 1.3 moles of neon gas at T= 339 K and p = 0.9 atm

et1wdwk4o 2022-05-14

(a) Which of the following corresponds to additional non-expansion work?
- Entropy
- Helmholtz energy
- Enthalpy
- Gibbs energy
(b) What is the basis for deriving an expression for entropy as a function of temperature and volume?
- Helmholtz energy
- Gibbs energy
- Internal energy
- Enthalpy

tiyakexdw4 2022-05-14

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 negative
b) It is positive
c) It is equal to 0
d) It depends on the value of the enthalpy of the reaction
e) None of the above

Autumn Pham 2022-05-14

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

Infer from a standard free energy change whether a reaction is exergonic or endergonic

datomerki8a5yj 2022-05-10

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

Spin 1/2 particles in magnetic Field B can take energies $E = \pm μ_{B} B$
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 $m = - (\frac{\partial F}{\partial B})_{T}$

Blaine Stein 2022-05-09

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

The differential of which quantity is inexact?
A) Gibbs Energy function
B) Enthalpy
C) work
D) Helmholtz energy function

dresu9dnjn 2022-05-09

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

Cesar Mcguire 2022-05-09

The Helmholtz free energy for a system of N harmonic oscillators

Yaritza Oneill 2022-05-09

Given thepartial differential forms $(\frac{\partial A}{\partial V})_{T} = P$ and $(\frac{\partial A}{\partial T})_{V} = - S$ what is the total differential of Helmholtz Free Energy in this case? Neglect all possible effects ofchemical potentials and assume that the process can occur.
A. $d A = - T d s - V d P$
B. $d A = - S d T + P d V$
C. $d A = S d T + P d V$
D. $d A = - P d S - S d V$

kromo8hdcd 2022-05-08

What conditions are necessary for the free-energy change to be used to predict the spontaneity of a reaction?

Micah Haynes 2022-05-08

Answer the following True or False questions, explaining your reasoning in terms of the laws of thermodynamics where appropriate: (a) The quantities U, H, A, and G all have the same dimensions (i.e. expressed in the same units). (b) A(TS) = (AT)S+TAS. (c) The chemical potential µ¡ of a component i is a state function. d) The chemical potential of benzene must equal the chemical potential of toluene in a benzene-toluene mixture.

Daphne Haney 2022-05-08

Consider a system in thermal equilibrium, having energies 0 and 'E'. Find the partition function (Z) and Entropy (S) of the system.

Trace Mcintyre 2022-05-01

Why is free energy “free” ?

nrgiizr0ib6 2022-04-30

How do you use gibbs helmholtz equation?what is the correct form for the gibbs helmholtz equation?

Noelle Wright 2022-04-12

What thermodynamic properties are extensive?

If you are already familiar with this thermodynamics concept and the potential, you should find the questions and the answers provided quite helpful as you are working with closed systems where the temperature and the volume are constant. Starting with the F = U - T S equation, you will be able to proceed with the calculations as you estimate the Helmholtz free energy function. You should take your time to look through the samples to understand the practical use. See at least one Helmholtz free energy example to proceed with your task correctly and get your estimations delivered on time.

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