Chemistry Unit Converter

Purpose and use case: The tool addresses practitioners who work with chemical quantities and need reliable conversions without manual lookup or calculator steps. Target users include students solving homework problems, educators preparing demonstrations, and researchers validating data. It focuses on chemistry-relevant unit categories: mass (g, mg), amount of substance (mol), volume (L, mL), and concentration (M, mM). It supports conversions that depend on molar mass and, when available, solution density. It does not perform reaction balancing or thermodynamic calculations.
Core operations: Direct unit ratios (L↔mL, g↔kg) and chemistry-specific transformations that rely on molar mass. Required inputs are amount, from_unit, and to_unit; optional inputs include chemical_formula to fetch molar_mass and enable mass↔moles. Advanced features include concentration conversions (M, mM) and density-based volume-to-mass context when density is supplied. It also supports automatic unit compatibility checks and consistent significant-figure handling.
Inputs & outputs: Inputs: amount (numeric, including scientific notation), from_unit, to_unit, chemical_formula (optional), density (optional, g/mL). Outputs: value (numeric), unit (string), and a formatted result string suitable for reporting. Validation covers numeric range, compatibility of units, and presence of molar_mass when required. Edge cases include negative amounts, missing molar_mass for mass↔moles, unknown formulas, or unsupported unit pairs; in such cases, a structured error is returned without UI prompts.
Industry & Localization: Calculations follow SI metric conventions with standard atomic weights and molar masses from references. Rounding defaults to four significant figures; downstream consumers may adjust. Assumptions include availability of molar_mass when required and absence of reaction chemistry context. Exclusions: reaction balancing, non-ideal solution effects, temperature-dependent density variations, and complex equilibria.