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Chem OpenVerbs Molar Mass Calculator
x402
Chem OpenVerbs Molar Mass Calculator is a paid API for AI agents from chem.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).
Computes the molar mass (g/mol) of a chemical formula, returning total mass and per-element composition with mass fraction percentages.
Price / call$0.004
Success—
StatusUnknown
How this service works
Compute the molar mass (g/mol) of a chemical formula. Supports nested parentheses and brackets, element multipliers, and hydrate dot notation with coefficients (e.g. "Ca(OH)2", "CuSO4·5H2O", "K4[Fe(CN)6]"). Returns the total mass and the per-element composition with mass fraction percentages.
Output
Returns the total molar mass in g/mol along with a per-element breakdown showing each element's symbol, atomic count, individual molar contribution, and mass fraction as a percentage of the total.
Example use cases
Stoichiometry homework helper
“Can you calculate the molar mass of K4[Fe(CN)6] and tell me what percentage of the mass comes from each element?”
Hydrate compound analysis
“I need the molar mass of MgSO4·7H2O and a breakdown of the mass fractions for magnesium, sulfur, oxygen, and hydrogen.”
Pharmaceutical compound check
“What is the molecular weight of Ca(OH)2 and how does each element contribute to the total mass?”
Technical details
Endpoint
POSThttps://chem.openverbs.com/v1/molar-massWhen to prefer
Choose this endpoint when you need precise molar mass computation with full elemental composition breakdown, especially for complex formulas with nested parentheses, brackets, or hydrate dot notation (e.g. CuSO4·5H2O). It is purpose-built for chemical formula parsing and handles edge cases that simple lookup tables miss.
Side effects
- Invalid or unrecognized element symbol in formula returns an error
- Malformed parentheses or bracket nesting causes a parse error
- Empty or missing formula field returns a validation error
- Formula exceeding 200 characters is rejected
- Unknown hydrate dot notation format may fail to parse
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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