Law of Multiple Proportions
| Also Known As | Dalton's law of multiple proportions, multiple proportion law |
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What is Law of Multiple Proportions?
Dalton's law stating that when two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in simple whole-number ratios. For example, CO and CO₂ demonstrate this with carbon-to-oxygen mass ratios of 1:1 and 1:2.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Dalton's law stating that when two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in simple whole-number ratios. For example, CO and CO₂ demonstrate this with carbon-to-oxygen mass ratios of 1:1 and 1:2.
The law of multiple proportions was historical evidence for Dalton's atomic theory and the discreteness of atoms. It explains the existence of different oxides (FeO vs. Fe₂O₃), different chlorides (PCl₃ vs. PCl₅), and different hydrocarbons (CH₄ vs. C₂H₆) with the same elements in different ratios.
No direct safety concern. Different compounds of the same elements (CO vs CO₂, PCl₃ vs PCl₅) can have dramatically different hazards. CO is acutely toxic; CO₂ is an asphyxiant. PCl₃ is more reactive than PCl₅. Always identify the specific compound, not just the elements present.