Determine if chemical equation is exothermic or endothermic?

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TheRedDevil18

How would I determine, if given a chemical equation is exothermic or endothermic?
Eg. Mg + 2HCL[itex]\rightarrow[/itex]MgCl2 + H2

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Borek

Mentor

Experimentally, or browsing tables.

Ygggdrasil

Gold Member

Look up the enthalpies of formation of the reactants and products then apply Hess's Law: https://en.wikipedia.org/wiki/Hess's_law

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