What is stoichiometry?

1 Answer
anor277 ยท Stefan V.
Aug 13, 2017

See this old answer and links. All chemical reactions observe "stoichiometry".

Explanation:

The balancing of chemical equations follows conservation of mass. If there are 10*g of products from all sources, AT MOST there can be 10*g of products. Chemical equations balance mass and charge absolutely, and due to (inevitable) losses on handling, yields are therefore less than quantitative.

In the case of multi-step syntheses (and some chemists specialize in the reactions), even a four step sequence with 90% yield at each step (and a synthetic chemist would gladly accept a 90% yield), the overall yield is reduced to 66% automatically. And this reflects mass equivalence: "garbage in equals garbage out".

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