Can anyone please help me with these 3 parts of a set of questions? I would appreciate an explanation too as the professor was not thorough on this concept.

1)

6.9 cm\" of water i1s boiled at atmospheric pressure to become 3842.7 em of steam. also at atmospheric pressure. (Calculate the work done by the gas during this process. The latent heat of vaporization of water is 2.26 x 10 J/kg . Answer in units of J. An engine using 1 mol of an ideal gas ini- tially at 22.6 L and 255 K performs a cycle consisting of four steps: 1) an isothermal expansion at 255 K from 22.6 L to 37.3 L ; 2) cooling at constant volume to 111 K ; 3) an isothermal compression to its original volume of 22.6 L; and 4) heating at constant volume to its original temperature of 255 K . Find its efficiency. Assume that the heat capacity is 21 J/K and the univer- sal gas constant is 0.08206 L . atm/mol/K = 8.314 J/mol/K. Give your answer in the form of a percentage.The interior of a refrigerator has a surface area of 2.4 m?. It is insulated by a 3 cm thick material that has a thermal conductivity of 0.0222 J/m s - C. The ratio of the heat ex- tracted from the interior to the work done by the motor is 4.8% of the theoretical maxi- mum. The temperature of the room is 35.5C, and the temperature inside the refrigerator is 8.5C. Determine the power required to run the COMPressor. Answer in units of W