Change in enthalpy

# Change in enthalpy - Change in enthalpy reaction at...

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Change in enthalpy, , is the heat absorbed or produced during any reaction at constant pressure. Hess's law states that for an overall reaction is the sum of the values for the individual reactions. For example, if we wanted to know the enthalpy change for the reaction we could calculate it using the enthalpy values for the following individual steps: Step 1: Step 2: Overall: If the enthalpy change is for step 1, and for step 2, then the enthalpy change for the overall reaction is calculated as follows: . It is also important to note that change in enthalpy is a state function, meaning it is independent of path. In other words, the sum of the values for any set of reactions that produce the desired product from the starting materials gives the same overall . Given Delta H = -1410 kJ/mol + Delta H = 1370 kJ/mol ------------------------------------------------------------------------ DeltaH = ____-40 kJ/mol______ What is the enthalpy for reaction 1 reversed?

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reaction 1 reversed: =1370 kJ/mol
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Change in enthalpy - Change in enthalpy reaction at...

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