Wize University Chemistry Textbook > Thermodynamics: Part 1: (0th law, 1st law, Calorimetry, Enthalpy)

0th Law of Thermodynamics

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0th Law of Thermodynamics

0th law: If a body, A, is in thermal equilibrium with a second body, B, and that body is in thermal equilibrium with a third body, C, then A and C are in thermal equilibrium. 
If two bodies/systems are in thermal equilibrium with one another, it means they are at the same temperature! 

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What is the difference between thermal equilibrium and temperature?
Thermal equilibrium: When two substances are in physical contact and exchange no heat energy with one another. 

Temperature: A measure of the average kinetic energy of the particles in a sample of matter 

Increasing the temperature means that average kinetic energy of the particles will (increase/decrease) increase
. 

Photo by CNS Openstax / CC BY

Extra Practice

Thermodynamics: Entropy Calculations

Using the following data, calculate the standard entropy of the reaction shown below. Enter your answer in units of J / (mol*K)
2 Al(s)+3 ZnO(s)→Al2O3(s)+3Zn(s)2\ Al_{(s)}+3\ ZnO_{(s)}\rightarrow Al_2O_{3(s)}+3Zn_{(s)}2 Al(s)​+3 ZnO(s)​→Al2​O3(s)​+3Zn(s)​
So(Al(s))=28.3 J mol−1K−1S^o(Al_{(s)})=28.3\ J\ mol^{-1}K^{-1}So(Al(s)​)=28.3 J mol−1K−1

Wize University Chemistry Textbook > Thermodynamics: Part 1: (0th law, 1st law, Calorimetry, Enthalpy)

0th Law of Thermodynamics

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0th Law of Thermodynamics

What is the difference between thermal equilibrium and temperature?

Extra Practice

Thermodynamics: Entropy Calculations