Question

The internal energy change in a system that has absorbed 2 kcals of heat and done 500 J of work is(a) 6400 J(b) 5400 J(c) 7900 J(d) 8900 J

Answer 1

c) 7900 j is the internal energy change

Answer 2

The internal energy of the system is 7900 Joules.

Explanation:

It is given that,

Heat absorbed by the system, Q = 2 kcal

Since, 1 cal = 4.2 J

Heat, Q = 8400 J

Work done by the system, W = 500 J

To find,

The internal energy charge in a system.

Solution,

Let U is the change in the internal energy. It can be calculated using first law of thermodynamics. It is given by :

$U=Q-W$

$U=8400-500$

U = 7900 J

So, the internal energy of the system is 7900 Joules. Hence, this is the required solution.

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First law of thermodynamics

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