Question

Five hundred joules of heat are added to a closed system. The initial internal energy of the system is 87 J, and the final internal energy is 134 J. How much work is being done by the system?
A) 221 J
B) 279 J
C) 366 J
D) 453 J

Answer 1

The answer is D. i got all the other ones wrong ._.

Answer 2

Answer;

453 Joules

Explanation;

• The change in internal energy = Final energy -initial energy

       = 134 J - 87 J

          = 47 Joules

• Energy added to the closed system is 500 joules
• Work done = energy added to the system -Change in internal energy

                  = 500 Joules - 47 Joules

                   = 453 joules

The work done is therefore, 453 joules.