Homework Help: Chemistry

Posted by Jared on Monday, May 7, 2007 at 12:45am.

Which of the following is the best definition of Hess' Law?

A. Heat evolved in a given process can be expressed as the sum of the heats of several processes that, when added, yield the process of interest.

B. The enthalpy of a process is the difference between the enthalpy of the products and the enthalpy of the reactants.

C. Since enthalpy is a state function, it will be different if a reaction takes place in one step or a series of steps.

D. Heat is always released by the decomposition of 1 mole of a compound into its constitute elements.

E. At constant pressure the enthalpy change of a reaction is equal to the heat change of a reaction.

A i think i put A and i got it right for my lab webwork

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