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Chemistry enthalpy question

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ayesha.:
Calculate the standard enthalpy change for the following rxn.

CH4 + 2O2(g) ? CO2(g) + 2H2O(l)

?Hf CO2 = -394 KJ/mol
?Hf H2O = -286KJ/mol
?Hf CH4 = -75 KJ/mol

Using the standard enthalpy of formation of methane and the data given below calculate the mean bond enthalpy of C-H bond in methane.

C(s) ? C(g) ?Hat of graphite = +715 KJ/mol
H2(g) ? 2H(g) ?H= +436 KJ/mol


Using the C-H bond enthalpy calculated and the standard enthalpy change for the reaction given below, calculate the mean bond enthalpy of the C-C bond in propane

C3H8 (g) ? 3C(g) + 8H(g)

ayesha.:
enthalpy change for the last rxn is +4020 KJ/mol

nid404:
What's the "?"  ?

ayesha.:
delta

unknown 101:
which pastpaper is this question from??
cuz if its not from a past paper then upload it here, cuz ur confusing everybody!!

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