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Infinite Forms of Hess's Law

Posted: Sat Jan 13, 2018 8:23 pm
by Mary Becerra 2D
Are there infinite forms of Hess's Law? All the problems I have encountered usually have between 2-4 chemical reactions to use, but is it possible to have more than that in one problem? Or are we limited to the number of reactions?

Re: Infinite Forms of Hess's Law

Posted: Sat Jan 13, 2018 8:26 pm
by Oscar Valdovinos 1I
Technically we could use Hess law to connect hundreds of equations, but I don't think we are going to see that in our problems because it would pointless since 2-4 equations shows that we know the concepts associated with Hess's law.

Re: Infinite Forms of Hess's Law

Posted: Sat Jan 13, 2018 10:30 pm
by Justin Chang 2K
Yeah, you can use Hess’s Law indefinitely to calculate enthalpies, since enthalpy is a state function you can just keep on adding and adding enthalpies. However, I guess for time’s sake, 2-4 equations is enough to test our knowledge of how enthalpy works and how chemical reactions work (for example, if you need to multiply a reaction by 2, then the deltaH also needs to be multiplied by 2).

Re: Infinite Forms of Hess's Law

Posted: Sun Jan 14, 2018 2:32 pm
by Aijun Zhang 1D
I think most of the formulas given are between two to four in tests since the time to finish exam is needed to be counted into consideration. However, I believe you can write infinite forms for Hess's law, especially in organic chemistry.
Just consider the reactants and products and try to link them together with other reactions

Re: Infinite Forms of Hess's Law

Posted: Sun Jan 14, 2018 3:07 pm
by Vincent Kim 2I
There can be much more than 2-4 reactions involved with the use of Hess's Law, but it's not necessary to use all of them because it's possible to represent the steps of a chemical reaction with fewer steps.

Re: Infinite Forms of Hess's Law

Posted: Sun Jan 14, 2018 9:36 pm
by Jessica Wakefield 1H
you could but for our purposes, i think we are only concerned with 2-4