Calculated result
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Formula parser and atomic weights
The local parser distinguishes element capitalization, positive integer subscripts, and parenthetical groups to a bounded nesting depth. Contributions use one fixed table covering all 118 named elements.
Notation and safety boundary
Hydrates, charges, isotope labels, reaction equations, fractional counts, and chemical names are rejected. Results are conventional formula/molar-mass arithmetic—not exact isotopic mass, synthesis, handling, toxicity, or dosing advice.
Worked example
The editable example values above demonstrate the formula and expose each conversion or parsing assumption used in the result.