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Delta values

Posted: Sat Jan 13, 2018 8:21 pm
by Ryan Neis 2L
What is the conceptual difference between delta h and delta u?

Re: Delta values

Posted: Sat Jan 13, 2018 9:17 pm
by Miranda 1J
DU is the total energy of the system whereas DH is the heat addition to the system at a specific temperature.

Re: Delta values

Posted: Sat Jan 13, 2018 11:55 pm
by Rachel N 1I
For delta H, do label the units as KJ or KJ/mol?

Re: Delta values

Posted: Sun Jan 14, 2018 6:52 pm
by Adrienne Dang 1B
I think it depends on the problem. I do know that delta h f (standard enthalpy of formation) is always in kj/mol. Most delta h values given in tables are in kj/mol, because they don't assume any values in the reaction. However, if the problem specifies mass or moles, you would likely multiply it by the values specified to just get kj.