chemistry

To interpret and compare heats of reaction (Hrxn), standard states must be used. What are the standard states for a gas, an aqueous solution, and a pure substance? Why are they important?

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  1. I would think this would be covered in your text/notes. Here is a reference but IUPAC rules don't always follow through in chemistry texts/journals. For example, most U.S. based chem text use 1 atm as standard pressure but IUPAC suggest 100 kPa (1 bar).

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  2. http://en.wikipedia.org/wiki/Standard_state

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