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    Why is my cycle wrong? The answer doesn't match if I use this cycle.
    Thanks for any help in advance!
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    (Original post by 123PC)
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    Why is my cycle wrong? The answer doesn't match if I use this cycle.
    Thanks for any help in advance!
    Can't read it without getting a crick in my neck ... so I won't
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    (Original post by charco)
    Can't read it without getting a crick in my neck ... so I won't
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    (Original post by 123PC)
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    Write out the relevant equations:

    equation 1: S8(s) + 8O2(g) --> 8SO2(g) ............ -2376 kJ
    equation 2: S8(s) --> 8S(g) ................................ ............................ +2232 kJ
    equation 3:O2(g) --> 2O(g) ................................ ............................ +496 kJ

    equation 1 can go via the elements in single atomic state (gaseous)

    S8(s) + 8O2(g) --> 8S + 16O ................ +2232 + 8(496) = 6200 kJ

    Then to go to 8SO2 is -16 x S=O bond enthalpy

    So

    -2376 = 6200 - 16(S=O)

    rearrange

    16(S=O) = 6200 + 2376 = 8576

    Hence S=O bond enthalpy = 8576/16 = 536 kJ
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    (Original post by charco)
    Write out the relevant equations:

    equation 1: S8(s) + 8O2(g) --> 8SO2(g) ............ -2376 kJ
    equation 2: S8(s) --> 8S(g) ................................ ............................ +2232 kJ
    equation 3:O2(g) --> 2O(g) ................................ ............................ +496 kJ

    equation 1 can go via the elements in single atomic state (gaseous)

    S8(s) + 8O2(g) --> 8S + 16O ................ +2232 + 8(496) = 6200 kJ

    Then to go to 8SO2 is -16 x S=O bond enthalpy

    So

    -2376 = 6200 - 16(S=O)

    rearrange

    16(S=O) = 6200 + 2376 = 8576

    Hence S=O bond enthalpy = 8576/16 = 536 kJ
    Thanks!
 
 
 
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