Bonds broken - Bonds formed vs. Products - reactants

[jhanago]

How do we know when to use either the equation of bonds broken - bonds formed or the delta h of products - reactants and where does the standard state delta h value of 0 come into play?

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[casper22]

I think all that would be mentioned in the question...

 

[Jab1113]

How do we know when to use either the equation of bonds broken - bonds formed or the delta h of products - reactants and where does the standard state delta h value of 0 come into play?

If the problem gives you delta H's for bonds broken/made then you know its reactants - products but if they give you delta H's of products then its products - reactant. hope that made sense