A gas is compressed at a constant pressure of 0.800 atm from 9.00 L to 3.00 L. In the process, 400 J of energy leaves the gas by heat. Required:
a. What is the work done on the gas?
b. What is the change in its internal energy?

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.