A mug contains 0.5 kg of liquid water at 50oC. (a) Determine the stored energy (E) of

Question:

A mug contains 0.5 kg of liquid water at 50oC.
(a) Determine the stored energy (E) of the system, neglecting the KE and PE. If 0.1 kg of liquid water at 10oC is is mixed with the warm water, determine
(b) The final stored energy (Ef) of the system assuming that no energy is lost during mixing. Use the SL state daemon.
(c) How do you explain a reduction of stored energy of the system?