This print-out should have 21 questions. Answer in units of me Multiple-choice questions may continue on the next column or page - find all choices 005 (part 2 of 3) 10.0 points before answering. Find the work done by the gas. Answer in units of k.J. 001 (part 1 of 2) 10.0 points An ideal gas at temperature To is slowly com- 006 (part 3 of 3) 10.0 points pressed at constant pressure of 2 atm from Find the thermal energy transferred. a volume of 10 liters to a volume of 2 liters Answer in units of k.J. Then the volume of the gas is held constant while heat is added, raising the gas tempera- 007 (part 1 of 2) 10.0 points ture back to To- An ideal gas, initially at a volume of Calculate the work done ON the gas. 1 atm 0.777778 L and pressure of 9 kPa, under- = 1.0x10' Pascals and 1 liter = 0.001 m". goes isothermal expansion until its volume is 7 L and its pressure is 1 kPa. 1. -800 J Calculate the work done by the gas during 2. +400 J this process. 3. +800 J Answer in units of J. 4. -1600 J 5. +1600 J 008 (part 2 of 2) 10.0 points - -400 J Find the heat added to the gas during this process. 002 (part 2 of 2) 10.0 points Answer in units of J. Calculate the heat flow INTO the gas 009 (part 1 of 2) 10.0 points 1. +1600 J A gas expands from / to F in the figure. The 2. +400 J energy added to the gas by heat is 460 J when 3. -1600 J the gas goes from I to F along the diagonal 1. +800 J path 5. -800 P (atm) -400 J 003 10.0 points A sample of helium behaves as an ideal gas as it is heated at constant pressure from 263 K to 383 K. If 10 J of work is done by the gas dur- ing this process, what is the mass of the he- lium sample? The universal gas constant is 1 2 8.31451 J/mol - K. V (liters) Answer in units of g- 004 (part 1 of 3) 10.0 points What is the change in internal energy of the Two moles of helium gas initially at 257 K gas? and 0.42 atm are compressed isothermally to Answer in units of J. 1.88 atm. Find the final volume of the gas. Assume 010 (part 2 of 2) 10.0 points that helium behaves as an ideal gas. The How much energy must be added to the gas universal gas constant is 8.31451 J/K - mol. by heat for the indirect path IAF to give the Homework 13, thermodynamics, engines 22-23-tejeda same change in internal energy? What is the mechanical power output of the Answer in units of J. engine if each cycle lasts for 0.215 s? Answer in units of KW. 011 (part 1 of 3) 10.0 points 3.1 cm of water is boiled at atmospheric 018 10.0 points pressure to become 3448.3 em of steam, also A steam engine (assume a Carnot engine ) has at atmospheric pressure, an efficiency of 47.2%. Calculate the work done by the gas during If the waste heat has a temperature of this process. The latent heat of vaporization 83.8 C, what is the temperature of the boiler? of water is 2.26 x 10 J/kg. Answer in units of "C. Answer in units of J. 019 (part 1 of 2) 10.0 points 012 (part 2 of 3) 10.0 points A Carnot engine has a power output of Find the amount of heat added to the water 148 kW. The engine operates between two to accomplish this process. reservoirs at 14'C and 720 C. Answer in units of J. How much thermal energy is absorbed each hour? 013 (part 3 of 3) 10.0 points Answer in units of J. Find the change in internal energy Answer in units of J. 020 (part 2 of 2) 10.0 points How much thermal energy is lost per hour? 014 10.0 points Answer in units of J. An engine using 1 mol of an ideal gas ini- tially at 19.8 L and 357 K performs a cycle 021 10.0 points consisting of four steps: The interior of a refrigerator has a surface 1) an isothermal expansion at 357 K from area of 5.5 m . It is insulated by a 2.1 cm 19.8 L to 37.4 L; thick material that has a thermal conductive 2) cooling at constant volume to 235 K; ity of 0.0269 J/m . s . C. The ratio of the heat 3) an isothermal compression to its original extracted from the interior to the work done volume of 19.8 L; and by the motor is 8.2% of the theoretical maxi- 4) heating at constant volume to its original mum. The temperature of the room is 34.8'C, temperature of 357 K and the temperature inside the refrigerator is Find its efficiency Assume that the D.8 C. heat capacity is 21 J/K and the univer- Determine the power required to run the sal gas constant is 0.08206 L . atm/mol/K = compressor. 8.314 J/mol/K. Answer in units of W. 015 (part 1 of 3) 10.0 points An engine absorbs 2213 J from a hot reservoir and expels 1180 J to a cold reservoir in each cycle What is the engine's efficiency? Answer with an efficiency in decimal form. 016 (part 2 of 3) 10.0 points How much work is done in each cycle? Answer in units of J. 017 (part 3 of 3) 10.0 points