Hess's Law

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Cowasjee_Sanaea_3E
Posts: 27
Joined: Fri Jul 22, 2016 3:00 am

Hess's Law

Postby Cowasjee_Sanaea_3E » Sat Jan 21, 2017 4:04 pm

How come when using Hess's law you usually don't include elements in their natural state (such as H2), but when it is combustion you do include it in calculating the enthalpy?
Thanks in advance!

Brandon_Phan_3J
Posts: 21
Joined: Wed Sep 21, 2016 2:56 pm

Re: Hess's Law

Postby Brandon_Phan_3J » Sat Jan 21, 2017 4:56 pm

Not sure if I'm understanding the question correctly, but I think you might be mixing up another concept with Hess' Law. Maybe in the question you were referring to the H2 was cancelled out during the process of manipulating the multi-step reactions to match the net reaction? Hope this helps


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