Using Heats of Formation

From the First Law of Thermodynamics, it can be seen that the enthalpy of a reaction can be determined from the heats of formation reagents and products:
ΔHrxn=ΣΔHf(prods)-ΣΔHf(reags)

This pages presents "generic" problems to provide practice in applying the above relationship. The problems are generic in that basic symbols are used to represent the chemical species rather that using actual chemical formulae. Further, to emphasize the methodology rather than the numbers, all heats of formation will have one sig figure and be between 10 and 100.

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