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31.

What is the main limitation of the first law of thermodynamics?

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32. Write the mathematical relationship connecting internal energy change, heat absorbed with work function.

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33.

Write mathematical statement of first law of thermodynamics.

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34.

In a process, 100J of heat energy is supplied and 50J of work is done on the system. What is the change in internal energy of the system ?

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35.

What is the difference between heat and work?

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36. Why heat is not a state function?

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In the following formula
∆U = q + w

As ∆U is a state function, hence q+w is a state function.

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38. The enthalpies of all elements in their standard states are:

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39.

Define extensive property ?

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40.

Why heat changes reported are usually enthalpy changes and not internal energy?

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