Matter is neither created nor destroyed in a chemical reaction. Thus, the mass of the products of a chemical reaction must be equal to the mass of the starting materials. Formally, this concept is called the law of conservation of mass. When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 16.8 g g of carbon were burned in the presence of 59.1 g of oxygen, 14.3 g of oxygen remained unreacted. What mass of carbon dioxide was produced?

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.