The same molecules having different coefficients (for example 2H 2O and 5H 2O) are the same compounds, present in different amounts. For this reason, when balancing chemical equations, subscripts of molecules cannot be changed. H 2O 2) have different chemical compositions, meaning they are not the same compound. Molecules in which the subscripts of atoms of the same elements are different (for example H 2O vs. ![]() Only coefficients of molecules can be changed in balancing equations. Coefficients represent how many molecules of a specific chemical compound are present in the reaction. Subscripts represent how many atoms of each element are present in a molecule. There are two types of numbers in chemical equations: subscripts and coefficients.
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