Atoms and the Atomic Theory ( Dr. Bülent BELİBAĞLI )

Law of Conservation of Mass

The total mass of substances present after a chemical reaction (rxn) is the same as the total mass of substances before the rxn.

Example: 0.455 g of Mg is burned in 2.315 g oxygen. The product is magnesium oxide (MgO). After the rxn the mass of unreacted oxygen is 2.015 g. What mass of MgO was produced ?

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