How to Write a Chemical Equation (with Pictures) - wikiHow
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Apr 30, 2021 . If you want to write a chemical equation, start by writing the chemical formulas of each reactant. Use the prefixes, such as mono-, di-, tri-, and tetra-, to figure out the number of atoms present for each element, and write this number as a subscript for each element. For example, dihydrogen monoxide would be more easily written as H2O.
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