12 14 2016 RWW07 Bond Energies Calorimetry WebAssign RWW07 Bond Energies Calorimetry Homework Current Score 65 100 Paddy Sheehan CH 201 section 002 Fall 2016 Instructor Robert Warren Due Friday September 23 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 0 10 points Previous Answers 0 174 mol of a solid was dissolved in 310 mL of water at 23 9 oC After the solid had fully dissolved the final temperature of the solution was 28 8 oC What is the molar heat of solution of the substance 3 65 36 5 kJ mol 2 10 10 points Previous Answers Use bond energies and the fact that the heats of formation of OF2 and OCl2 are 24 7 and 80 37 kJ mol respectively to determine the O F and O Cl bond energies DO F 192 DO Cl 206 191 kJ mol 205 kJ mol 3 10 10 points Previous Answers Use a table of bond energies to determine the atomization energy of PCl3 and the average P Cl bond energy in PCl3 DP Cl 323 2 323 2 kJ mol Use the P Cl bond energy and the atomization energy of POCl3 to determine the P O bond energy in POCl3 DP O 503 503 3 kJ mol http www webassign net web Student Assignment Responses view key dep 14314088 1 3 12 14 2016 RWW07 Bond Energies Calorimetry 4 20 20 points Previous Answers Use Bond energies to estimate the heats of formation of the following gases Hf kJ mol Compound NF3 107 H2N NH2 86 107 86 F2C CH2 379 6 CH3Cl 380 74 8 75 Hint The standard state of carbon is solid graphite but bond energies are for reactions in which all reactants and products are in the gas phase You must use the heat of formation of carbon gas and bond energies to determine this energy 5 10 points What is the specific heat of a metal if addition of 95 0 g of the metal at 11 8 oC to 250 0 g of Cu s 0 38 J g oC at 197 8 oC produces a mixture that reaches thermal equilibrium at 152 5 oC 0 322 J g oC s No Response 6 25 25 points Previous Answers Balance the combustion reaction of chrysene C18H12 at 298K 1 1 C18H12 s 21 21 O2 g 18 18 CO2 g 6 6 H2O l What is the value of ng for the combustion reaction ng 3 What is 3 mol Hcomb of chrysene if Hcomb 8950 Ecomb 8942 6 kJ mol 8950 0 kJ mol What is the heat of formation of chrysene Hf 152 2 152 2 kJ mol http www webassign net web Student Assignment Responses view key dep 14314088 2 3 12 14 2016 RWW07 Bond Energies Calorimetry 7 5 points A serving contains 4 g of fat 12 g of carbohydrates and 7 g of protein How many dietary calories are in a serving No Response 112 C 8 10 points The combustion of 2 650 mmol of X caused the temperature of a bomb calorimter to rise from 23 700 oC to 26 300 oC Assume T 25 000 oC Hcomb 2411 kJ mol and ng 3 mol gas mol X for the combustion and determine the heat capacity of the calorimeter C No Response 2 465 kJ oC http www webassign net web Student Assignment Responses view key dep 14314088 3 3
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