Physical Chemistry : Heat Transfer

Study concepts, example questions & explanations for Physical Chemistry

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Example Questions

Example Question #1 : Heat Transfer

A chemical reaction is run in which  of work is done by the system and the internal energy changes by . What is the total amount of heat transferred?

Possible Answers:

Correct answer:

Explanation:

The First Law of thermodynamics states that for a system that only exchanges energy by heat or work: 

Work is done by the system, therefore

Example Question #2 : Heat Transfer

An automobile engine provides  of work to push the pistons and generates  of heat that must be carried away by the cooling system. What is the change in the internal energy of the engine?

Possible Answers:

Correct answer:

Explanation:

The First Law of thermodynamics states that for a system that only exchanges energy by heat or work: 

The heat is given off by the system, so . Similarly, work is being done by the system, so 
 

Example Question #3 : Heat Transfer

A chemical reaction is run in which  of heat is absorbed and the internal energy changes by . What is the amount of work done?

Possible Answers:

Correct answer:

Explanation:

The First Law of thermodynamics states that for a system that only exchanges energy by heat or work: 

Heat is absorbed by the system, therefore 

 

So 

 done by the system. 

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