A diver is filling an air tank for a dive in T  C water. However, filling the tank takes place on land, where the temperature is 25  C . The tanks have a volume of V liters and are made from 10 kg of stainless steel with a specific heat of 420 J/(kg K ). The tanks are filled up to a pressure of P bar. Air c an be assumed to be a mixture of 80% nitrogen and 20% oxygen with average van der Waals parameters: an air = 1.3724 bar L 2 /mol 2 b air = 3.7332  10 - 2 L/mol E. Assuming ideal gas behavior for the air, determine the pressure of the air in the tank after it was cooled down to the temperature of the water during the dive. F. How much heat transfer needs to occur to cool down the steel of the air tank and the air inside it from 25  C to the temperature of water during the dive? Express your answer from the perspective of the air tank, i.e. heat transfer from the air tank to the surrounding water will have a negative sign