When using chemical formula it is possible to calculate the percentage composition of the chemical. This can be useful when extracting metals from ores or when making fertilisers for specific plants.

C—H—O, C—H—N, C—H—O—N, C—H; C—H—S, C—H—O—S, C—H—N—S, C—H—O—N—S. By Dr. H. Gysel. Pp. xxii + 637. (Basel: Verlag Birkhäuser ...

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