12/14/2016 RWW06 First Law of Thermodynamicshttp://www.webassign.net/web/Student/AssignmentResponses/view_key?dep=14314087 1/3Current Score : 99.25 / 100 Due : Friday, September 16 2016 11:59 PM EDT1. 10/10 points | Previous AnswersWhat is the energy change in a system if 120 J of heat are absorbed by the system and 480 J of workare done by the system?E = 360 360 J2. 15/15 points | Previous AnswersHow 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/goC:ice=2.0liquid = 4.2steam = 2.0Water has the following phase change enthalpies in kJ/molheat of fusion at 273 K = 6.01heat of vaporization at 373 K = 40.7Express your answer to the nearest 0.1 kJ.10.979 11.0 kJ3. 19.25/20 points | Previous AnswersDetermine H, q, w, and E at 298 K and 1 atm for the complete reaction of 9.220 g of N2O4.N2O4(g) + 2N2H4(l) 3N2(g) + 4H2O(l).The heat of formation of liquid hydrazine (N2H4) is 50.63 kJ/mol. Use tabulated data for other heats offormation.The tolerance on each question is only 0.03 kJ, so express all answers to 0.01 kJ.H = 125.66 125.68 kJq = 125.66 125.68 kJw = .4976 0.5 kJE = 126.1574 126.18 kJRWW06 First Law of Thermodynamics (Homework)Paddy SheehanCH 201, section 002, Fall 2016Instructor: Robert WarrenWebAssignThe due date for this assignment is past. Your work can be viewed below, but no changes can be made.12/14/2016 RWW06 First Law of Thermodynamicshttp://www.webassign.net/web/Student/AssignmentResponses/view_key?dep=14314087 2/34. 15/15 points | Previous AnswersWhat 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 1atm and 298K?q = 607.7 608 kJ w = 1.83 1.83 kJSelect the correct statement.5. 25/25 points | Previous AnswersWhat is the enthalpy change of each of the following reactions?Reaction H (kJ/mol)Ag2O(s) + H2(g) 2Ag(s) + H2O(l)254.2 254.78Fe2O3(s) + 3CO(g) 2Fe(s) + 3CO2(g)24.8 24.772Ag1+(aq) + Pb(s) 2Ag(s) + Pb2+(aq)210.66 210.24NH3(g) + 5O2(g) 4NO(g) + 6H2O(g)906.4 905.3CH3COOH(l) + 2O2(g) 2CO2(g) + 2H2O(l)875.18 874.2 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.12/14/2016 RWW06 First Law of Thermodynamicshttp://www.webassign.net/web/Student/AssignmentResponses/view_key?dep=14314087 3/36. 15/15 points | Previous AnswersThe 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/molb) What is the heat of formation of toluene?Hf = 12.41 12.4
View Full Document
Unlocking...