A chemical process in which heat is absorbed.
A change in which q=30 J, w=44 J.
A process in which a system does work on its surroundings with no change in q.
A process in which work is done on a system and an equal amount of heat is withdrawn.

In how many of these cases does the internal energy of the system decrease? (0,1,2,3,4)

Number of cases where internal energy of system decreases = 1

Explanation:

According to first law of thermodynamics-

where, , q and w represents change in internal energy, heat exchanged and work done respectively.

So, number of cases where internal energy of system decreases = 1

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