Entropy Change For Melting Ice, Heating Water, Mixtures & Carnot Cycle of Heat Engines - Physics

This physics video tutorial explains how to calculate the entropy change of melting ice at a constant temperature of 0C using the latent heat of fusion of ice. It explains how to calculate the entropy change of heating water from 0C to 100C using two different formulas. The entropy change equals the heat transferred divided by the temperature in kelvin. You can also calculate using a formula with natural logs. It also explains how to calculate the entropy of a mixture such as mixing hot water with cold water. Finally, it discusses the entropy change of the carnot cycle of a typical heat engine and how to calculate it. This thermodynamics video contain many practice problems.

Carnot Cycle:

Otto Cycle:

Refrigerators and Heat Pumps:

Heat Engines and Refrigerators Review:

Physics 1C Final Exam Review:

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Physics 2 - Basic Introduction:

Electric Charge - Physics:

Conservation of Electric Charge:

Coulomb's Law and Electric Force:

Electric Fields:

Electric Dipole Moment:

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Electric Flux:

Gauss Law Problems:

Electric Potential:

Equipotential Lines:

The Electron Volt:

Electric Potential Energy:

Physics PDF Worksheets:

[leenmuslem]

I just wanna say that paying my university fees is losing money. I am passing the exam by your explanation. In reality, I see all the students in the uni watching you before any exam. THANK YOU and keep on

[gianlucacastro]

I have yet to study something without ending up watching your videos, they are just too easy to understand

[Ben-xedr]

Thank you so much for this, you're the reason I haven't failed college yet

[ryan_uwu]

For the mixture problem would the process of finding final temperature be different if the mass of the two objects were different?

[wamrikhotso]

The elementary mercury, Hg, is a silvery liquid atom at room temperature. The normal freezing point of mercury is -36.9 ºC, and its molar enthalpy of fusion is ∆Hfus = 2.29 kJ/mol. What is the entropy change (∆S ) of the system when 50.0 g of Hg (l) freezes at the normal freezing point?

[teeheecows]

5:52, i think you mean the *final* temp is 50 not avg. I could be wrong, but you referred to it as final temp and you proceeded to find the actual avg temps later in your work.

[dr.lennartlichtenstein]

U r pass next failur student in my class

[asseelessam]

In the second question, the 2nd way to solve, you don’t convert the specific heat unit from celsius to kelvin ?? Why you use the same value 4184 j/kgc ??

[sennugatobiloba]

Thank you so much I’ve learnt a lot so far on this channel and this is the first time I’m typing a comment. I was taught to convert my shc to 4.184 Buh you never did. Why?

[kininagothu]

at 2:17 we were taught to take moles, not mass. I have been doing it such. Someone help out in which is right?

[eltonl.]

at 11:00 and forward, you used 4184 for your heat capacity yet the units are J/Kg*C. How are you able to use 4184 in the equation that has the temperatures in Kelvin?

[mgboseu]

i have a quesion if given condition is P = 1.5atm, T = 373K then can we calculate entropy of air?..

[aliciaruvalcaba]

Did he say what the final T was for problem 3?

[reinholdkattiamushelelo]

Hi guys, how do I post a question to this amazing organic chemistry tutor?

[Andymufc]

whats the difference between latent heat of fusion and entalpy h?

[nekomari]

DeltaS= (Q/T avg) + (Q/T avg)

Is this formula applicable only for water/water mixture?

What about metal in water?

[tu_nonna_emiliana]

i don't think i am going to make in an hour so i'm jus going to leave a comment right here

[amberjaramillo]

why does this sound like mark wahlberg