Midterm Problem 1A

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Midterm Problem 1A

Postby samuelkharpatin2b » Mon Feb 27, 2017 7:23 pm

Hi, I have a question regarding problem 1A on the midterm. On several practice midterms I have seen problems such as this one be accepted as full credit when the units are either kJ OR kJ/mol. Can someone please explain why that isn't the case here? (Here the problem accepted kJ/mol and not just kJ).

Thank you.

Iris Feng 2I
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Joined: Wed Sep 21, 2016 2:57 pm

Re: Midterm Problem 1A

Postby Iris Feng 2I » Mon Feb 27, 2017 7:47 pm

The question asks for standard enthalpy of formation, which is always going to be kJ/mol. By definition, standard enthalpy of formation is "the change in enthalpy when one mole of a substance in the standard state (1 atm of pressure and 298.15 K) is formed from its pure elements under the same conditions"

Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

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