Hess cycle - enthalpy change given enthalpies of combustion and formation?

Hiya! im a bit lost w this hess cycle .... could u pls help me out? the process of lactic fermentation using glucose can be summarized as follows: C6H1206 ---> CH3CHOHCOOH calculate the enthalpy change for lactic acid fermentation given the following enthalpies of combustion and formation: delta Hc... show more Hiya! im a bit lost w this hess cycle .... could u pls help me out?

the process of lactic fermentation using glucose can be summarized as follows:

C6H1206 ---> CH3CHOHCOOH

calculate the enthalpy change for lactic acid fermentation given the following enthalpies of combustion and formation:

delta Hc (glucose) -2805 kJmol-1
delta Hc (lactic acid) -1364 kJmol-1
delta Hf (CO2) -393.5 kJmol-1
delta Hf (H2O) -285.2 kJmol-1

My problem here is that ive never constructed a hess cycle with the enthalpy of combustion and formation together

I dont even know where to start from ... should I construct one using combustion n formation? can i construct a double hess cycle??

PLEASE HELP

thx v much!!!
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