Question

63 J of heat are added to a closed system. The initial energy of the system is 58J, and the final internal energy is 93J. How much work is being done by the system?

Answer 1

ΔU = Q + W

• heat in, Q +
• heat out, Q -
• does work , W -
• work in, W +

93-58 = 63 + W

35 = 63 + W

W = - 28 J (does work/being done by system)