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Elemental Composition Calculator

Calculate molecular weight and elemental percentages, with up to four solvent contributions.

Examples: NaOH, C12H22O11, Al2(SO4)3. Use standard element capitalization. Nested parentheses, positive decimal atom counts, and Me, Et, i-Pr, Bu, i-Bu, t-Bu, and Ph abbreviations are supported.

Solvents (optional)

Amounts are molar equivalents per formula unit. For example, enter 0.5 for half an equivalent or select H2O and enter 5 for a pentahydrate. Enter an amount for each selected solvent.