# Services from chemistry-calc.x402tookit.com on Zero

> chemistry-calc.x402tookit.com serves 11 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/chemistry-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/chemistry-calc.x402tookit.com/health.json

## Services

- [Chemistry Calculators – Molar Mass & Percent Composition](https://www.zero.xyz/c/chemistry-calculators-molar-mass-percent-composition-9468bb2f/llms.txt): $0.02/call via x402. Calculates the molar mass and elemental percent composition for any chemical formula, including parentheses, brackets, and hydrates like CuSO4·5H2O.
- [Chemistry Calculators – Limiting Reagent & Theoretical Yield](https://www.zero.xyz/c/chemistry-calculators-limiting-reagent-theoretical-yield-5566f474/llms.txt): $0.02/call via x402. Calculates the limiting reagent, theoretical yield, and excess leftover for each reactant in a balanced chemical reaction given reactant masses; optionally computes percent yield.
- [Chemistry Calculators – Mole Conversion](https://www.zero.xyz/c/chemistry-calculators-mole-conversion-ec3a3166/llms.txt): $0.02/call via x402. Converts between grams, moles, and molecule counts for a given chemical formula using Avogadro's number and molar mass.
- [Chemistry Calculators – Dilution Calculator (C1V1=C2V2)](https://www.zero.xyz/c/chemistry-calculators-dilution-calculator-c1v1-c2v2-be2deb3b/llms.txt): $0.02/call via x402. Solves the dilution equation C1×V1=C2×V2 for any missing variable given three known values, and returns solvent to add and dilution factor.
- [Chemistry Calculators: Empirical Formula from Composition](https://www.zero.xyz/c/chemistry-calculators-empirical-formula-from-composition-1b7d0b5c/llms.txt): $0.02/call via x402. Calculates the empirical formula (and optionally molecular formula) of a compound from its elemental percent or gram composition
- [Chemistry Calculators – Bond Polarity](https://www.zero.xyz/c/chemistry-calculators-bond-polarity-49101b1b/llms.txt): $0.02/call via x402. Determines the bond type (nonpolar covalent, polar covalent, or ionic) between two elements based on their Pauling electronegativity difference.
- [Chemistry Calculators – Molarity Calculator](https://www.zero.xyz/c/chemistry-calculators-molarity-calculator-6e30e3b1/llms.txt): $0.02/call via x402. Calculates the molarity of a solution from solute grams and volume, or the grams of solute needed to achieve a target molarity and volume.
- [Chemistry Calculators – pH/pOH Calculator](https://www.zero.xyz/c/chemistry-calculators-ph-poh-calculator-8a325648/llms.txt): $0.02/call via x402. Calculates pH, pOH, hydrogen-ion concentration, and related values for strong acids/bases, weak acids/bases, and buffers using Henderson-Hasselbalch.
- [Chemistry Calculators – Radioactive Decay / Half-Life](https://www.zero.xyz/c/chemistry-calculators-radioactive-decay-half-life-b65bd7af/llms.txt): $0.02/call via x402. Calculates radioactive decay: remaining fraction or amount after elapsed time, time to reach a given fraction (useful for carbon dating), decay constant, and mean life — for named isotopes or custom half-lives.
- [Chemistry Calculators – Element Lookup](https://www.zero.xyz/c/chemistry-calculators-element-lookup-a77b6c04/llms.txt): $0.02/call via x402. Looks up periodic table data for any element by symbol, name, or atomic number, returning weight, electron configuration, electronegativity, melting/boiling points, density, and more.
- [Ideal Gas Law Calculator (PV=nRT)](https://www.zero.xyz/c/ideal-gas-law-calculator-pv-nrt-9de52996/llms.txt): $0.02/call via x402. Solves for any one unknown in the ideal gas law equation PV=nRT given the other three values, supporting multiple common units for each quantity.

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