The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is
(a) 8900 J (b) 6400 J
(c) 5400 J (d) 7900 J
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Heat given to a system () is equal to the sum of increase in the internal energy and the work done by the system against the surrounding and 1 cal=4.2J.
According to first law of thermodynamics
= 7900 J