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Formulas

Law of Reciprocal Proportions

If two different elements combine separately with a fixed mass of a third element, the ratio of the masses in which they do so are either the same as or a simple multiple of the ratio of the masses in which they combine with each other.

Chemistry
Subject
General Chemistry
Sub Subject
Basic Concepts
Chapter
Laws Of Chemical Combination
Topic

Law of Reciprocal Proportions

📊 intermediate
$$W_{AB} = \frac{W_{AC} \times W_{BC}}{W_C}$$
If two different elements combine separately with a fixed mass of a third element, the ratio of the masses in which they do so are either the same as or a simple multiple of the ratio of the masses in which they combine with each other.
Variables & Units
$W$
Combining weights of elements
Unit: Mass units
Key Information
📐 Derived From
Dalton's Atomic Theory.
💡 Example
Sulfur and Oxygen combining with Hydrogen to form $H_2S$ and $H_2O$.
🔧 Applications
Stoichiometric calculations.
⚠️ Constraints
Pure substances only.

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