Question

Enthalpy, Internal Energy and PV Work -Muvable piston Heating Coil Gas An electrical heater delivers 8.600 k) of energy (as heat) to a system consisting of the gas inside a cylinder having a movable piston. As a result, the piston moves against a constant external pressure such that P AV = 2.580 k). What is the change in internal energy for the system? Answer to the nearest 0.001 k). Submit Answer Tries 0/5 a Post Discussion Send Feedback

Answer 1

According to first law of thermodynamics, the amount of heat supplied to the system is utilized to increase the internal energy and to do the external work.

The amount of heat supplied to system , q = change in internal energy ($\Delta$U) + workdone

                                                   8.600 = $\Delta$U + 2.580

The change in internal energy, $\Delta$U = 8.600-2.580 = 6.020 kJ