Standard Enthaly of Formation

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Hannah 3c
Posts: 12
Joined: Fri Sep 25, 2015 3:00 am

Standard Enthaly of Formation

Postby Hannah 3c » Sun Jan 10, 2016 5:13 pm

In the course reader on page 19, it briefly explains the standard enthalpy of formation. I am just confused about how the delta H for reaction equals -555.38 kJ and how you go from that value to the final -277.69 kJ.mol?

Kaitlin Ross 3E
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Re: Standard Enthaly of Formation

Postby Kaitlin Ross 3E » Sun Jan 10, 2016 5:15 pm

The standard enthalpy of formation is the standard reaction enthalpy for the formation of 1 mole of a substance. Since there are 2 moles of the product in the reaction given in the course reader, you divide the standard reaction enthalpy by 2.

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