Assignment Help - homework help

  Characteristics of entropy

Characteristics of entropy ‘S’:

1) The word ‘S’ entropy is develop from the formulation of II law of thermodynamics as thermodynamic state function.

2) Entropy change ‘ΔS’ of a system beneath a procedure is stated as the constant equivalent to the ratio of the heat change associated a process at constant temperature to the temperature of the system beneath process. The process must be reversible at that temperature.
 
Heat, q is not a state function, however for a reversible process, Δq = (q2-q1) divided by temperature (T) of the process is a state function.

3) A spontaneous procedure is accompanied by raise in the ‘disorder’ or ‘randomness’ of the molecules comprising the system. Entropy rises in all spontaneous processes. Therefore entropy might be regarded as the measure of disorder or arbitrariness of the molecules of the system.

4) Whenever a system undergoes a physical or a chemical procedure, there takes place a change in the entropy of the system and as well in its surroundings. This total change in the entropy of the system and its surroundings is referred as the entropy change of the universe brought around by the procedure. For an isothermal process (i.e., T=constant), the entropy change of the universe during a reversible procedure is Zero.

The entropy of the universe rises in an irreversible process.

5) The energy of the universe stays constant however the entropy of the universe tends to maximum.

6) For a spontaneous procedure, at constant T, ΔS is positive (i.e., ΔS > 0).

ΔS is positive (i.e., ΔS > 0). For an equilibrium procedure, ΔS is zero.

For non spontaneous process,

ΔS is negative or (i.e., ΔS < 0).

7) Units of entropy:

The dimension of entropy is energy in terms of heat X temperature-1. The entropy is stated as calories per degree that is termed to as the entropy units (i.e., eu).  As entropy also depends on the amount of the substance, unit of entropy is calories per degree per mole or eu. Per mole.

cgs units of entropy is cal.K-1 symbolized as eu. The SI unit is JK-1 and symbolized as EU. 1 eu = 4.184 EU.

8) Entropy change is associated to enthalpy change as shown below:

For reversible and isothermal process,

ΔS = (Δq rev)/T

As ΔH is the heat absorbed or evolved in the process at constant T and pressure P. ΔS is also computed from ΔH as ΔS = ΔH/T, where T is the temperature of the process including ΔH, quantity of enthalpy change, at constant pressure.

 

Latest technology based Chemistry Online Tutoring Assistance

Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Chemical Thermodynamics homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Chemical Thermodynamics, project ideas and tutorials. We provide email based Chemical Thermodynamics homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Chemical Thermodynamics. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Physical-Chemistry Homework Help and assignment help services. They use their experience, as they have solved thousands of the Chemistry assignments, which may help you to solve your complex issues of Chemical Thermodynamics. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
Home | Company Overview | Services | Discover Q&A | Sitemap | Contact Us | T & C | Refund Policy | Copyright Policy | Blog | Q&A | Directory

©TutorsGlobe All rights reserved 2022-2023.