[mescalito89]

How would i solve this problem

Calculate the DeltaH for the following reaction

C6H6 + 3/2 O ----> 6C + 3H20

thank you

[S.V.]

The formula for DeltaH is DeltaH_rxn = summation [nDeltaH_f(products) - mDeltaH_f(reactants)].
Note that DeltaH for products and reactants is taken to be at standard conditions.
m and n are numbers of moles.
Therefore, you will have DeltaH_rxn=6(DeltaH C) + 3(DeltaH H₂O) - 1(DeltaH C₆H₆) - 1.5(DeltaH O).
You can look up the standard enthalpies of the elements and compounds in a chemistry book.