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Standard Enthalpy of Formation lecture example

Posted: Sun Jan 22, 2017 2:17 pm
by Christina_F_3F
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?

Re: Standard Enthalpy of Formation lecture example  [ENDORSED]

Posted: Sun Jan 22, 2017 5:49 pm
by AlexSun2L
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.