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Basic Concepts of Chemistry: Law of Chemical Combination
Chemistry is an important subject that deals with the study of chemicals and their properties. In this chapter, we will learn about the basic concepts of chemistry, including the significance of chemicals, elements, mixtures, chemical combinations, and the laws of chemical combination.
The first law of chemical combination is the Law of Conservation of Mass, which states that the mass of two compounds on one side is equal to the newly formed compound. In other words, the sum of the mass of reactants should be equal to the sum of the mass of products.
EXAMPLES OF LAW OF CONSERVATION OF MASS
Let’s take an example of carbon combining with oxygen to form carbon dioxide. The atomic mass of carbon is 12, and the mass of oxygen is 16. Hence, 1 carbon and 2 oxygen atoms combine to form carbon dioxide, which has an atomic mass of 44. Therefore, the sum of the mass of reactants (12+16×2) is equal to 44, the mass of the product.
Although this law is basic, it is crucial to note that it still holds true in most chemical reactions.
Here’s a question to test your understanding of the Law of Conservation of Mass: 1.5 grams of ethane on complete combustion give 44 grams of carbon dioxide and 2.7 grams of H2O. Show that the reaction obeys the Law of Conservation of Mass.