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enthalpy, entropy, enthalpy of formation

Hey could anyone help me with this question? Not sure where to start!
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Cobalt_
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https://www.youtube.com/watch?v=NWyC19gf32s
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Avatar for jacksonmeg
jacksonmeg
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Original post by Cobalt_

Thanks!
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jacksonmeg
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Original post by Cobalt_

Should I rearrange ΔHoreaction=∑ΔHof(products)−∑ΔHof(Reactants)
to give products, and then find literature values for reactants? or is there some other link im missing?
Reply 4
Avatar for Cobalt_
Cobalt_
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Original post by jacksonmeg
Should I rearrange ΔHoreaction=∑ΔHof(products)−∑ΔHof(Reactants)
to give products, and then find literature values for reactants? or is there some other link im missing?



You need the Van't Hoff equation for that question.

In terms of comparing the lit to the value you calculated; just comment on it. Why is there a difference? How much difference? Maybe do a percentage..
Reply 5
Avatar for jacksonmeg
jacksonmeg
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Original post by Cobalt_
You need the Van't Hoff equation for that question.

In terms of comparing the lit to the value you calculated; just comment on it. Why is there a difference? How much difference? Maybe do a percentage..

I eventually remembered enthalpy of formation of H2 and O2 is 0, so isn't the enthalpy of formation of H2O = enthalpy of reaction?
Reply 6
Avatar for Cobalt_
Cobalt_
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Original post by jacksonmeg
I eventually remembered enthalpy of formation of H2 and O2 is 0, so isn't the enthalpy of formation of H2O = enthalpy of reaction?


Yeh but you still need to use the Van't Hoff equation to calculate the enthalpy of reaction = Enthalpy of formation.

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