Title: mole ratio Long Title: IUPAC Gold Book - mole ratio DOI: 10.1351/goldbook.15341 Status: current Definition Amount of one constituent divided by the amount of a second constituent in the same system. For constituents 1 and 2, \[r_{12} = n_{1}/n_{2}\] Related Term - constituent: https://goldbook.iupac.org//terms/view/16269 Source - PAC, 2008, 80, 233. 'Glossary of terms related to solubility (IUPAC Recommendations 2008)' on page 255 (https://doi.org/10.1351/pac200880020233) Other Outputs - html: https://goldbook.iupac.org/terms/view/15341/html - json: https://goldbook.iupac.org/terms/view/15341/json - xml: https://goldbook.iupac.org/terms/view/15341/xml Citation: Citation: 'mole ratio' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.15341 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. Accessed: 2026-06-11T20:47:12+00:00