Question

Heat of 30 kcal is supplied to a system and 4200 J of external work is done on the system so that its volume decreases at constant pressure.What is change in its internal energy ?

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Answer 1

Answer:

according to the law of thermodynamic

Explanation:

∆U= W/p

hence pressure is kept constant p=k

U - U=w/p

U= U/w

U= 4200/30 = 140j

the energy float to lower because these system is covered