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It supports\nordinary formulas such as `H2O`, weight-percent annotations such as\n`Pt5wt%/SiO2`, and flexible catalyst loading notation such as `1%Pt/SiO2`,\n`Pt1%/SiO2`, and `1wt%Pt@SiO2`.\n\n## Installation\n\n```sh\nnpm install @ameyanagi/chemical-formula\n```\n\nWith Bun:\n\n```sh\nbun add @ameyanagi/chemical-formula\n```\n\n## Quick Start\n\n```ts\nimport {\n molecularWeight,\n parseFormula,\n toMolecularFormula,\n toWtPercent,\n} from \"@ameyanagi/chemical-formula\";\n\nconst catalyst = parseFormula(\"1%Pt/SiO2\");\n\nconsole.log(catalyst);\n// {\n// formula: \"Pt1wt%O2Si\",\n// elements: [\"O\", \"Si\", \"Pt\"],\n// stoichiometry: { O: 2, Si: 1 },\n// wt_percent: { Pt: 1 }\n// }\n\nconst molecular = toMolecularFormula(\"1%Pt/SiO2\");\nconsole.log(molecular.stoichiometry.Pt);\n// 0.0031109624054201776\n\nconst water = toWtPercent(\"H2O\");\nconsole.log(water.wt_percent);\n// { H: 11.19067443796836, O: 88.80932556203165 }\n\nconsole.log(molecularWeight(\"H2O\"));\n// 18.015\n```\n\n## API\n\n```ts\ntype FormulaSummary = {\n formula: string;\n elements: string[];\n stoichiometry: Record;\n wt_percent: Record;\n};\n```\n\n- `parseFormula(input: string): FormulaSummary`\n- `toMolecularFormula(input: string): FormulaSummary`\n- `toWtPercent(input: string): FormulaSummary`\n- `molecularWeight(input: string): number`\n\nAll parsing and conversion errors are thrown as JavaScript errors.\n\n## Supported Notation Examples\n\nThese examples all describe 1 wt% Pt on silica:\n\n```ts\nparseFormula(\"1%Pt/SiO2\");\nparseFormula(\"Pt1%/SiO2\");\nparseFormula(\"1wt%Pt/SiO2\");\nparseFormula(\"Pt1wt%/SiO2\");\nparseFormula(\"1wt%Pt@SiO2\");\nparseFormula(\"1 wt % Pt / SiO2\");\n```\n\nBare `%` is interpreted as `wt%`.\n\nNested materials are supported:\n\n```ts\nconst composite = toWtPercent(\"(Pt5wt%/SiO2)50wt%(CeO2)50wt%\");\n\nconsole.log(composite.wt_percent.Pt);\n// 2.5000000000000004\n```\n\n## Package Notes\n\nThis package is generated from the Rust crate with `wasm-pack` and targets\nNode.js-compatible runtimes.\n","readmeFilename":"README.md"}