I only need help on part D and the answer is provided. please show all conversion factors

2. A piston-fitted cylinder with a 6cm inner diameter contains 1.4g of nitrogen. The mass of the piston is 4.5kg and a 25kg weight rests on the piston. The gas temperature is 30C and the pressure outside the cylinder is 2.5atm. a. Prove that the pressure of the gas within the cylinder is 355kPa(3.5atm) by equating the force of the gas within the cylinder with the restraining force of the piston. b. What is the volume of the gas within the cylinder (in L)? c. Suppose the weight is abruptly lifted and the piston rises to a new equilibrium position. Further suppose that the process takes place in two steps: a rapid step in which a negligible amount of heat is exchanged with the surroundings, followed by a slow step in which the gas returns to 30C. Consider that gas as the system, write the energy balances for step 1, step 2, and the overall process. In all cases, neglect kinetic and potential energy. If U varies proportionately with temperature, does the gas temperature increase or decrease during step 1? Explain your reasoning. d. If the work done by the gas in step 1 in part b equals the restraining force times the distance traveled by the piston, estimate this quantity (in J ) and use it to determine the work transferred to or from the surroundings during step 2 of the process in part c. Answers b. 0.354L d. 30,7J