Delta values

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Ryan Neis 2L
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Delta values

Postby Ryan Neis 2L » Sat Jan 13, 2018 8:21 pm

What is the conceptual difference between delta h and delta u?

Miranda 1J
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

Re: Delta values

Postby Miranda 1J » Sat Jan 13, 2018 9:17 pm

DU is the total energy of the system whereas DH is the heat addition to the system at a specific temperature.

Rachel N 1I
Posts: 48
Joined: Thu Jul 27, 2017 3:00 am

Re: Delta values

Postby Rachel N 1I » Sat Jan 13, 2018 11:55 pm

For delta H, do label the units as KJ or KJ/mol?

Adrienne Dang 1B
Posts: 30
Joined: Fri Sep 29, 2017 7:05 am

Re: Delta values

Postby Adrienne Dang 1B » Sun Jan 14, 2018 6:52 pm

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.

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