Hess's law example | Thermodynamics | Chemistry | Khan Academy

Hess's law example. Created by Sal Khan.

Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.

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[adreadinhell]

my chem professor gave up on me, my tutors gave up on me, my family gave up on me. you.... this video brought me to tears because i finally understand hess's god damn law. 

[eegusspam]

I have chem exam tomorrow and this video just cleared all my confusions about Hess's Law. Thank You very much.

[russelljohnson]

Sal, i WISH u know how much you've helped me throughout my high school years and the beginning of uni! u are a gift to this world!

[TheItouchhacker]

So basically all that we are trying to do is get each element or compound onto the correct side right?

[albadadkola]

you've made me the chem topper of my school! thank u, thank u soooo much!

[EYEBZTRIPPIN]

So this was what my instruxtor was attempting to explain. Thnx sal

[Dragonite]

Sum of enthalpies of combustion of reactants - Sum of enthalpies of combustion of products

[athirahhusna]

this video is very helpful! I'm a slow learner so learning something one by one really helps my brain.

[elijahr_]

Just subbed. This made me pass my thermodynamics exam haha it's the least I could do.

[MyNameIsGagan]

I pay attention during class and this still makes more sense :\

[ahmadshiddiqn]

I wish you replace one or maybe all of my exact teachers in my school

[yawnproductions]

I feel that one of the reasons this guy is so successful is because he repeats himself so much! gaseous methane...gaseous methane...gaseous methane....it helps things stick! love this freaking dude

[kikkirow]

Gosh you are so helpful! Thank you so much, you have helped me throughout my chemistry class this semester. Hopefully I can do well on my test tomorrow!

[widowdev]

Thanks so much Sal, my professor briefly explained it and when she assigned us a problem to do I was lost. You shed the light on me!

[TBlev]

How ironic that you would cover this subject from my very same Chemistry textbook right after we covered it in class!

[siphiwomhlongo]

The best channel for Chemistry ... Period!!! These videos are a great complement to my lecture notes as lecturers usually assume we have some sort of background knowledge

[itsokrunrun]

Thank youuuu! wouldn't have known what to do without ur excellent, world-best videos!

[taco]

Hah, I thought I was screwed for my chem test tomorrow, but watching this video has me prepared. Keep doing good work like this please.

[xi-mipa-iammagma]

thanks mate... you saved my ass from the chemistry exam last year, and it seems you're about to save me again.

[Sorrow]

Great video Salman, just learned something I was absolutely stumped on at my chem lecture. THANKS ALOT!