ction: Read, analyze and solve the following word problems. 1. Five moles of an ideal monoatomic gas with an initial temperature of 127 C expand and, in the process, absorb 1200 J of heat and do 2100 J of work. What is the final temperature of the gas? 2. A gas in a cylinder expands from a volume of 0.110 m to 0.320 m . Heat flows into the gas just rapidly enough to keep the pressure constant at 1.65 x 109 Pa during the expansion. The total heat added is 1.15 x 105 J. (a) Find the work done by the gas. (b) Find the change in internal energy of the gas. 3. An aircraft engine takes in 9000 J of heat and discards 6400 J of heat each cycle. (a) What is the mechanical work output of the engine during one cycle? (b) What is the thermal efficiency of the engine? 4. Two objects, B,(T=40.C) and B2(T=18.C), experienced entropy changes of 6.4 x 10* J/K and 2.8 x 104 K, respectively after they had been placed in direct contact with each other. B, lost 2.0 x 10' J of heat. How much heat was lost by B2? What was the entropy change in the universe after the process? Z