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A stoichiometric equation is a notation that describes a chemical reaction using chemical formulae. An example is CH4 + 2 O2 -> CO2 + 2 H2O

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Is 2h2 plus 202-2h20?

The equation you provided seems to be a mix of chemical formulas and an arithmetic expression. If you're asking whether (2H_2 + 202 - 2H_{20}) is a valid chemical reaction or expression, it doesn't represent a standard chemical equation. For clarity, please provide more context or specify what you mean by the terms.


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