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Law of Definite Proportions: The Empirical Formula of a Metal Oxide


To use the law of conservation of mass and the law of definite proportions

To calculate empirical formula of a compound

To purify the major product by converting the by-products into the major product


Curriculum alignments:


HS-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass are conserved during a chemical reaction.


Structure 1.4. Counting particles by mass: The mole


4.5. Stoichiometry

AS & A Level Empirical and molecular formula


10.1 Basic laws of chemistry and chemical calculations


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