12 14 2016 RWW06 First Law of Thermodynamics WebAssign RWW06 First Law of Thermodynamics Homework Current Score 99 25 100 Paddy Sheehan CH 201 section 002 Fall 2016 Instructor Robert Warren Due Friday September 16 2016 11 59 PM EDT The due date for this assignment is past Your work can be viewed below but no changes can be made 1 10 10 points Previous Answers What is the energy change in a system if 120 J of heat are absorbed by the system and 480 J of work are done by the system E 360 360 J 2 15 15 points Previous Answers How many kilojoules of heat must be supplied to 3 5 g of ice at 15 oC to convert it to steam at 149 oC Use the following specific heats in J g oC ice 2 0 liquid 4 2 steam 2 0 Water has the following phase change enthalpies in kJ mol heat of fusion at 273 K 6 01 heat of vaporization at 373 K 40 7 Express your answer to the nearest 0 1 kJ 10 979 11 0 kJ 3 19 25 20 points Previous Answers Determine H q w and N2O4 g 2N2H4 l E at 298 K and 1 atm for the complete reaction of 9 220 g of N2O4 3N2 g 4H2O l The heat of formation of liquid hydrazine N2H4 is 50 63 kJ mol Use tabulated data for other heats of formation The tolerance on each question is only 0 03 kJ so express all answers to 0 01 kJ H 125 66 q 125 66 w 4976 E 126 1574 125 68 kJ 125 68 kJ 0 5 kJ 126 18 kJ http www webassign net web Student Assignment Responses view key dep 14314087 1 3 12 14 2016 RWW06 First Law of Thermodynamics 4 15 15 points Previous Answers What are q and w in kJ for the reaction of 34 0 g of Na s and 78 0 g of Cl2 g to produce NaCl s at 1 atm and 298K q 607 7 608 kJ w 1 83 1 83 kJ Select the correct statement Heat is given off by and work is done on the system Heat is absorbed by and work is done on the system Heat is given off by and work is done by the system Heat is absorbed by and work is done by the system 5 25 25 points Previous Answers What is the enthalpy change of each of the following reactions Reaction Ag2O s H2 g 2Ag s H2O l H kJ mol 254 2 Fe2O3 s 3CO g 2Fe s 3CO2 g 24 8 2Ag1 aq Pb s 2Ag s Pb2 aq 210 66 4NH3 g 5O2 g 4NO g 6H2O g CH3COOH l 2O2 g 2CO2 g 2H2O l http www webassign net web Student Assignment Responses view key dep 14314087 906 4 875 18 254 78 24 77 210 2 905 3 874 2 2 3 12 14 2016 RWW06 First Law of Thermodynamics 6 15 15 points Previous Answers The heat of combustion of liquid toluene C7H8 is 3910 3 kJ mol at 1 atm and 298 K a What is the energy of combustion at 1 atm and 298 K Ecomb 3905 3 3905 3 kJ mol b What is the heat of formation of toluene Hf 12 41 12 4 kJ mol http www webassign net web Student Assignment Responses view key dep 14314087 3 3
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