# Known activation enthalpy?

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Thread starter 7 years ago
#1
Does anyone know where to find the known activation enthalpy of the reaction between sulphuric acid and magnesium?
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Thread starter 7 years ago
#2
anyone?
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7 years ago
#3
(Original post by Andyfrog321)
anyone?
Perhaps you can determine the enthalpy by the standard enthalpy of formation? are any quantities given?
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7 years ago
#4
(Original post by Kallisto)
Perhaps you can determine the enthalpy by the standard enthalpy of formation?
Don't mix kinetics with thermodynamics.
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7 years ago
#5
(Original post by Borek)
Don't mix kinetics with thermodynamics.
Thanks for hint, Borek! so activation enthalpy is another word for activation energy, isn't it? could it be that the quantity which is asked for can be calculated by arrhenius equation? I must confess that I didn't have calculate an activation energy so far.
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7 years ago
#6
(Original post by Kallisto)
Thanks for hint, Borek! so activation enthalpy is another word for activation energy, isn't it?
That's my understanding.

could it be that the quantity which is asked for can be calculated by arrhenius equation?
Most likely.
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7 years ago
#7
(Original post by Borek)
That's my understanding.
Never heard this alternative word before. I have learnt something new again.

(Original post by Borek)
Most likely.
If that is the case, there must be concrete numeric values to solve the activation energy. As far as I can see a logarithmic function for activation energy is required.
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7 years ago
#8
(Original post by Kallisto)
Never heard this alternative word before. I have learnt something new again.

If that is the case, there must be concrete numeric values to solve the activation energy. As far as I can see a logarithmic function for activation energy is required.

(Original post by Borek)
That's my understanding.

Most likely.
Well just depends on how you define it. Enthalpy is enthalpy, energy is typically gibbs free energy. So they are different.

You are probably more likely to find the activation ENERGY as if i remember correctly from my phy chem lectures last year it can be determined from the changes in the activation volume. You're never going to find this on the 'normal internet'. It will be in highly specialised journals for very specific systems. Even then you'll need to understand all the stat mech that goes with it to be able to use it.
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