Question

The internal energy of a system increases by 36 joules. The system does work using 17 joules. What amount of heat was added to this system? joules\

Answer 1

53 j have a nice day

Answer 2

General internal energy expression:

Uf = (Ui-W) + Q

Where Uf = Final internal energy, Ui = Initial internal energy, W = Work done, Q = Heat added

But,
Uf -Ui = ΔU = 36 J, W = 17 J. Then,
ΔU = -W +Q => Q = ΔU+W = 36+17 = 53 J

Therefore, heat added to the system is 53 Joules