Midterm Problem 1A

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samuelkharpatin2b
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Joined: Wed Sep 21, 2016 2:57 pm

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
Posts: 13
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"


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