Standard Enthalpy of Formation lecture example  [ENDORSED]

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Christina_F_3F
Posts: 21
Joined: Fri Jul 22, 2016 3:00 am

Standard Enthalpy of Formation lecture example

Postby Christina_F_3F » Sun Jan 22, 2017 2:17 pm

In lecture/the course reader (pg. 17), there is an example provided for standard reaction enthalpy that involves solid graphite, hydrogen gas, oxygen gas, and liquid ethanol. In the example, the delta H naught rxn is provided as -555.38 kJ. I was just curious how this number was found, or if we need to know how to find this value if it is not provided?

AlexSun2L
Posts: 7
Joined: Wed Sep 21, 2016 2:57 pm

Re: Standard Enthalpy of Formation lecture example  [ENDORSED]

Postby AlexSun2L » Sun Jan 22, 2017 5:49 pm

For that particular question, the standard enthalpy of formation of 2 moles of CH3CH2OH (l) is provided for you and no calculations are necessary. For problems that deal with formation of products, the standard enthalpy of formation should be provided.


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