12 14 2016 RWW09 Equilibrium and Thermodynamics WebAssign RWW09 Equilibrium and Thermodynamics Homework Current Score 100 Paddy Sheehan CH 201 section 002 Fall 2016 Instructor Robert Warren Due Wednesday October 5 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 20 points Consider the following reaction N2 g 3H2 g 2NH3 g Report all answers to three significant figures a Determine the standard free energy of the the reaction at 298K Go No Response 33 0 kJ b Determine the equilibrium constant at 298K K No Response 6 09e05 c Determine the reaction quotient when the partial pressures of the gases are the following N2 6 10 atm H2 11 00 atm NH3 4 30 atm Q No Response 2 28e 03 d Determine the value of G No Response G when the reaction mixture is the one described in Part c 4 81e 01 kJ http www webassign net web Student Assignment Responses view key dep 14314090 1 4 12 14 2016 RWW09 Equilibrium and Thermodynamics 2 12 points Consider the following reaction at 298K NH41 CN1 HCN NH3 Go Q and Determine G at 298K for the following concentrations if K 1 70 NH3 NH41 CN1 HCN 0 140 M 0 140 M 0 100 M 0 150 M a Go No Response 1 315 kJ mol b Q No Response 1 500 c G No Response 0 310 kJ mol 3 12 points The heat of vaporization of a compound at 300 K is 28 7 kJ mol and its vapor pressure is 249 3 torr Determine the following thermodynamic properties of the vaporization at 300K Go No Response 2 78 kJ mol So No Response 86 4 J mol K Assume that Ho and So are temperature independent and estimate the normal boiling point of the compound to the nearest degree Celcius t No Response 59 oC http www webassign net web Student Assignment Responses view key dep 14314090 2 4 12 14 2016 RWW09 Equilibrium and Thermodynamics 4 20 points The vapor pressure of solid CO2 dry ice is 280 torr at 90 oC and 105 torr at 100 oC a What is the value of Go for the reaction CO2 s CO2 g at each temperature 90oC Go No Response 100oC 1 52 No Response 2 85 kJ mol b Use the above values for the standard free energies to determine the standard enthalpies and entropies for the sublimation Assume both quantities are constant over this temperature range So No Response 0 133 kJ mol K Ho No Response 25 9 kJ mol A dry ice bath is used routinely in the laboratory to keep things cold It is made by mixing dry ice powder with a solvent to make a slurry Estimate the temperature of the bath to the nearest degree Celcius by determining the temperature at which the vapor pressure of CO2 is 1 atm t No Response 78 oC 5 12 points The equilibrium constant of a reaction is 3 55e 02 at 375 K and 6 03e 03 at 500 K Determine the following for this reaction Ho No Response 3 532e 01 kJ mol So No Response 1 430e 02 J mol K What is the value of the equilibrium constant at 438 K K No Response 1 81e 03 http www webassign net web Student Assignment Responses view key dep 14314090 3 4 12 14 2016 RWW09 Equilibrium and Thermodynamics 6 24 points Consider the reaction TiO2 s 2C graphite 2Cl2 g TiCl4 g 2CO g Determine the following at 298 K Ho No Response 39 54 kJ mol So No Response 241 J mol K Go No Response 111 6 kJ mol What is log K at 298K log K ln K 2 3026 log K No Response Assume that Ho and 19 56 Hint log K ln K 2 3026 So are temperature independent to determine the following at 1000 K Go No Response log K No Response 280 54 kJ mol 14 653 log K ln K 2 3026 http www webassign net web Student Assignment Responses view key dep 14314090 4 4
View Full Document
Unlocking...