Law of Multiple Proportions
States that if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in a ratio of small whole numbers.
What is Law of Multiple Proportions?
When two elements combine to form more than one compound, the masses of one element which combine with a fixed mass of the other element are in the ratio of small whole numbers.
Key points
- To understand the relationship between the masses of elements in different compounds.
- To be able to apply the Law of Multiple Proportions to solve quantitative problems.
- To appreciate the empirical basis of atomic theory.
Common exam trap
Confusing it with the Law of Definite Proportions or the Law of Reciprocal Proportions.
Definitions
- Term
Law of Multiple Proportions
- Meaning
When two elements combine to form more than one compound, the masses of one element which combine with a fixed mass of the other element are in the ratio of small whole numbers.
- Term
Stoichiometry
- Meaning
The quantitative study of reactants and products in a chemical reaction.
Learning objectives
To understand the relationship between the masses of elements in different compounds.
To be able to apply the Law of Multiple Proportions to solve quantitative problems.
To appreciate the empirical basis of atomic theory.
Prerequisites
Understanding of elements and compounds.
Basic concepts of atomic mass and molecular mass.
Ability to perform simple ratio calculations.
Familiarity with chemical formulas.
Common mistakes
Confusing it with the Law of Definite Proportions or the Law of Reciprocal Proportions.
Incorrectly calculating the fixed mass of one element.
Failing to simplify the ratio of masses to its smallest whole number form.
Applying it to compounds formed by more than two elements.
Keywords
Law of Multiple Proportions
John Dalton
Stoichiometry
Atomic Theory
Chemical Combination
Whole Number Ratio
Empirical Law
Practice preview
Which law states that if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in a ratio of small whole numbers?…
easy
Water (H₂O) and hydrogen peroxide (H₂O₂) are formed from the elements hydrogen and oxygen. If 1 gram of hydrogen combines with oxygen to form water, it combines with 8 grams of oxygen. If 1 gram of hydrogen combines with…
easy
Carbon monoxide (CO) and carbon dioxide (CO₂) are formed from carbon and oxygen. If 12g of carbon combines with 16g of oxygen to form CO, what mass of oxygen will combine with 12g of carbon to form CO₂?…
easy