Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed...

Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed in Appendix 2 from your book.

a. C2H4(g)+3O2(g)>2CO2(g)+2H2O(l)

b. 2H2S(g)+3O2(g)>2H2O(l)+2SO2(g)

Solutions

Expert Solution

standard enthalpy change in kJ/mol
ethene C2H4 is + 52.47
hydrogen sulfide H2S is - 52.47
sulfur dioxide SO2 is - 296.84
water liquid H2O is - 285.83
carbon dioxide CO2 is - 393.51
oxygen O2 is zero

heat of combustion for- C2H4 + 3O2 ---> 2CO2 + 2H2O

Heat of combustion = 2CO2 + 2H2O - C2H4 - 3O2
heat = 2( - 393.51) + 2( - 285.83) - ( + 52.47) - 0
Heat of combustion = - 1411.15 kJ/mol
negative means exothermic (heat released)

Similarly for

heat = 2H2S + 3O2 ---> 2H2O + 2SO2

Heat of combustion = 2H2O + 2SO2 - 2H2S - 3O2
heat = 2( - 285.83) + 2( - 296.84) - 2( - 20.63) - 0
Heat of combustion = - 1124.08 kJ/mol
negative means exothermic (heat released)

queen_honey_blossom answered 1 year ago

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