Hess Law Chemistry Problems - Enthalpy Change - Constant Heat of Summation

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The organic chemistry tutor, you are the hope of all high school and college students. Thank you

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I had given up on understanding Hess's Law until i watched this video. Thank you so much! You don't know how much you've helped me and many other students

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[@chrisc884]

An interesting thing that I've found with Hess' Law is that we can group each reaction into a Matrix instead of just stacking them on top of each other. For example: (17:20) [1] 2H2O -> 2H2 + O2, dH = +572 kJ [2] CO2 -> C + O2, dH = +394 kJ [3] 2C2H2 + 5O2 -> 4CO2 + 2H2O, dH = -2600 kJ --------------------------------------- [4] C2H2 -> 2C + H2 Can be rewritten as: H2 | +2 0 0 | | +1 | C | 0 +1 0 | [path] | +2 | C2H2 | 0 0 -2 | | -1 | Where each row represents a species not eliminated by rxn [4], each column in the matrix represents rxns [1-3], the final column represents the net coefficients in rxn [4], and the +/- signs each represents which side of the thermochemical equation a species is on (+ indicating it's a product, - indicating it's a reactant). The [path] signifies the factor which transforms a species' coefficient from that of matrix [rxn 1-3] into the net [rxn 4]. This is made easier by eliminating the species which are unnecessary, those being CO2, O2, and H2O. Now, as displayed above, it is simply a matter of taking the sum of the coefficients in each row, taking note of how they transform into the "net" column. H2 has a coefficient of 2, and is on the product side of the equation. It's "net" gives a coefficient of 1, also a product, and thus we can determine that the path will be (+1/2) . Doing the same for Carbon and Acetylene will likewise give factors of (+2) and (+1/2) respectively. Last but not least, we will multiply the dH values of each rxn by their path factor, add them all together, and get a final answer of -226 kJ. Hope that helps!

[@chrisc884]

Method is derived from Khalil, Mutasim I. (2000), "Calculating Enthalpy of Reaction by a Matrix Method"

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[@Joshy1313]

@theorganicchemist Isn't DeltaH in the problem @6:15 the difference between the equations? Why the sum?

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Yeah so for whatever reason this seemed a lot harder... probably because I can’t stay awake during class... well anyways off to take the exam now thanks for making it seem a lot easier

[@lukeb1663]

Also for the problem at 17:45 I would’ve just multiplied that middle equation by 4 and then divided everything by two at the end which seems much simpler

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Thank you sir but the examples are easy

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Please some explain why it become negative 1716?

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The concept and teaching was good but u should not give monotonous questions the questions should be of different types But then too video was helpful

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I did not understand hess's law problems until 20 min ago. Thank you.

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I have a chemistry exam this Tuesday on Thermochemistry including a problem on Hess' Law. Your tutorial is exactly what I needed in order to successfully solve the practice exam problems. Thanks so much!

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if you're more math oriented/have taken precalc, take a close look at this (and balancing equations, and redox, and so much other shit)...it's all linear algebra/matrix algebra/systems of linear equations. If you're good with matrices or want a more rigorous way to go about solving these, you can balance anything like this using matrices, row reduction, and finding the determinant. (figured that one out on my final by complete accident when I decided "fuck it". It worked.)

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going to try using matrices on the problem from 7:34

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actually how would you use the values from 7:34 and out that Into a matriz

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looks like the online classes bring us here.. stay safe fellow students!

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My exam got delayed so i slacked off a bit and forgot evrything

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Im in chemistry AP (advance program) and i question myself everyday why i took ap. bu thank you for this video no I understand more about hess law. GOOD LUCH LUCK FOR MY CHAPTER EXAM

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Professor Organic Chemistry Tutor, thank you for a basic explanation of Hess Law and How to apply it to Enthalpy Change of reaction by finding the heat of summation of individual reactions in AP/General Chemistry. Although the practice problems are simple to follow and understand, I am still confused about this material. I will review Hess Law from top to bottom in order to understand this material. This is an error free video/lecture on KZbin TV with the Organic Chemistry Tutor.

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Think of Hess’s law as having multiple reactions that you can either flip divide by a coefficient or multiply by a coefficient to get your desired reaction

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