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Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products, leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of the products can be empirically determined, then the amount of the other reactants can also be calculated. Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. This particular chemical equation is an example of complete combustion. Stoichiometry measures these quantitative relationships, and is used to determine the amount of products and reactants that are produced or needed in a given reaction.
You should be able to entertain your date or your spouse for endless hours with your intelligent conversation regarding chemistry while you sit at the Drive-In movie watching a really bad movie. We are almost done now. We are going to take some of the last chapters and put them all together. We have learned how to balance equations and what balanced equations mean. We have learned all about the mole and how to convert between different ways to express the quantity of material. Go back to the basic kitchen recipe for a minute. If you need two cups of flour to ultimately make 4 dozen cookies, how much flour would you need to make 8 dozen cookies?
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Stoichiometry is the study of the relative quantities of reactants and products in chemical reactions and how to calculate those quantities. Chemical equations are symbolic representations of chemical reactions. The reacting materials reactants are given on the left, and the products are displayed on the right, usually separated by an arrow showing the direction of the reaction. The numerical coefficients next to each chemical entity denote the proportion of that chemical entity before and after the reaction. The law of conservation of mass dictates that the quantity of each element must remain unchanged in a chemical reaction. Therefore, in a balanced equation each side of the chemical equation must have the same quantity of each element. Chemical equations : A chemical equation shows what reactants are needed to make specific products.