Homework (Ref: AQA Exampro) Bond energies: C-C 348 kJ mol-1 C-H 413 kJ mol-1 C-O 358 kJ mol-1 O-H 463 kJ mol-1 O=O 498 kJ mol-1 C=O 805 kJ mol-1 This equation shows the reaction between ethene and oxygen. C2H4 + 3O2 2CO2 + 2H2O The structural formulae in the equation below show the bonds in each molecule involved. Use the three stages shown at (a), (b) and (c) below to calculate the nett energy transfer when the formula mass (1 mole) of ethene reacts with oxygen. (a) Write down the bonds broken and the bonds formed during the reaction. (Some have already been done for you.) (2) (b) Calculate the total energy changes involved in breaking and in forming all of these bonds. (Some have already been done for you.) (4) (c) Describe, as fully as you can, what the figures in (b) tell you about the overall reaction. ............................................................................................................. .............................................................................................................
Homework (Ref: AQA Exampro) Bond energies: C-C 348 kJ mol-1 C-H 413 kJ mol-1 C-O 358 kJ mol-1 O-H 463 kJ mol-1 O=O 498 kJ mol-1 C=O 805 kJ mol-1 This equation shows the reaction between ethene and oxygen. C2H4 + 3O2 2CO2 + 2H2O The structural formulae in the equation below show the bonds in each molecule involved. Use the three stages shown at (a), (b) and (c) below to calculate the nett energy transfer when the formula mass (1 mole) of ethene reacts with oxygen. (a) Write down the bonds broken and the bonds formed during the reaction. (Some have already been done for you.) (2) (b) Calculate the total energy changes involved in breaking and in forming all of these bonds. (Some have already been done for you.) (4) (c) Describe, as fully as you can, what the figures in (b) tell you about the overall reaction. ............................................................................................................. .............................................................................................................
1623-Chemical%20Industry%20-%20Use%20of%20Chemical%20Calculations%2C%20Moles%20and%20Masses.docx