Differentiate between Reversible and Irreversible process?

              

Why the standard heat of formation of diamond is not zero , although it is an element .

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Ans.)  The standard heat of formation of diamond is not zero because it is slightly less stable form of carbon.

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Neither q and w is a state function , yet q + w is a state function . why?

 

 Ans.) q and w are not state function but q + w is equal to change in I.E(∆U) and I.E is a state function.

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Can the absolute value of internal energy be determined? why or why not?

Ans.)  The absolute value of internal energy can't be determined because it is the sum of so many types of energies that can't be determines accurately . But change in Internal Energy (∆U) can be determine.

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