HW 8.57

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Wesley_Rugen_1E
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Joined: Fri Jul 22, 2016 3:00 am

HW 8.57

Postby Wesley_Rugen_1E » Thu Jan 19, 2017 8:55 pm

The question asks to determine the reaction enthalpy for the hydrogenation of ethyne to ethane, C2H2(g) + 2H2(g) -> C2H6(g). What happens when we hydrogenate something? What do we add to the equation?

Grace_Bower_2B
Posts: 13
Joined: Wed Sep 21, 2016 2:58 pm

Re: HW 8.57

Postby Grace_Bower_2B » Thu Jan 19, 2017 10:32 pm

You're overcomplicating it. Hydrogenation just means adding hydrogen, this case adding hydrogen to ethyne to turn it into ethane. It's not telling you that you have to do something to the equation, just naming the reaction occurring (like combustion)

Justin_Yi_1J
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Re: HW 8.57

Postby Justin_Yi_1J » Thu Jan 19, 2017 10:32 pm

To hydrogenate it means to add hydrogen to the molecule. You see in the given reaction H2 is added to the C2H2, making it C2H2. The pi bond breaks between the carbons and the electrons pair with the hydrogen diatomic molecules that also have their bonds broken.


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