A 30 kg aluminum block cools down from its initial temperature of 500 K to the atmospheric

Question:

A 30 kg aluminum block cools down from its initial temperature of 500 K to the atmospheric temperature of 300 K. Determine the total amount of entropy transfer from the system's universe. Assume the specific internal energy of aluminum (in kJ/kg) is related to its absolute temperature (K) through u = 0.9T.