Name Thermo Unit Reaction Enthalpies 1 Use the following enthalpy data to calculate the reaction enthalpy for the combustion of methanol 2CH 3OH l 3O2 g 4H 2O g 2CO2 g H1 H 2 H 3 1 C s O2 g 2H 2 g CH 3OH l 2 1 H 2 g O2 g H 2O g 2 C s O2 g CO2 g 239 kJ mol 1 242 kJ mol 1 393 5 kJ mol 1 Work 2 H1 2CH 3OH l 2C s O2 g 4H 2 g 478 kJ mol 1 4 H 2 4H 2 g 2O2 g 4H 2O g 968 kJ mol 1 2 H 3 2C s 2O2 g 2CO2 g 787 kJ mol 1 Final Answer 2CH 3OH l 3O2 g 4H 2O g 2CO2 g H 1277 kJ mol 1 2 Use the enthalpies of formation from the table on the back to calculate the enthalpy for this same reaction Work H r Products Reactants H r 4 H H 2O 2 HCO2 2 HCH 3OH H r 4 241 8 2 393 5 2 238 6 1277 kJ mol 1 3 Use the bond energy table on the back to calculate the enthalpy for this same reaction Reactants Products 3 C H 3 413 kJ mol 1239 kJ mol 2 O H 2 463 kJ mol 926 kJ mol x4 1 C O 1 358 kJ mol 358 kJ mol 3704 kJ mol 1 O H 1 463 kJ mol 463 kJ mol 2 C O 2 799 kJ mol 1598 kJ mol x2 All so far x2 4120 kJ mol 3196 kJ mol 3 O2 3 495 kJ mol 1485 kJ mol TOTAL 6900 kJ mol TOTAL 5605 kJ mol More Work H r Reactants Products H r 5605kJ mol 6900 kJ mol 1295 kJ mol 1 Revised SH 7 16 13 LaBrake Vanden Bout 2013 Name Revised SH 7 16 13 LaBrake Vanden Bout 2013
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