Hess' Cycle Watch

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#1
Report Thread starter 12 years ago
#1
Fe(s) + CuSO4(aq) --> FeSO4(aq) + Cu(s)

Mg(s) + CuSO4(aq) --> MgSO4(aq) + Cu(s)

Assuming the enthalpy changes for those two reactions are know, how would you contruct a Hess' cycle to calculate the enthalpy change for:

Mg(s) + FeSO4(aq) --> MgSO4(aq) + Fe(s)
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NathanM
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#2
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flip the first equation and reverse the sign of the enthalpy for it ie change + to -

and cancel out anything that appears on both the left and right
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#3
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So you'd have: Cu(s) + Fe2+(aq) --> Cu2+(aq) + Fe(s) ?

I'm still not sure what to do
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NathanM
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#4
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this should explain it

http://i72.photobucket.com/albums/i1...6/scan0022.jpg
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#5
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Ohhhhhh, thanks alot!
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