Question

A system receives 525 J of heat and delivers 525 J of work to its surroundings. What is the change in internal energy of the system?

Answer 1

`"0 J"`

Explanation:

On receiving `"525 J"` of heat the internal energy of the system is increased by `"525 J"`

When the system now does `"525 J"` of work its internal energy is decreased by `"525 J"`

∴ There is no overall change in internal energy.