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Chemical composition, also known as chemical makeup or simply, composition, is a concept in chemistry that has different, but similar, meanings if referred to a single pure substance or a mixture. The chemical composition of a mixture can be defined as the distribution of the single substances that constitute the mixture, called "components". In other words, it is defined giving the concentration of each component. Because there are different ways to define the concentration of a component, as a consequence there are also different ways to define the composition of a mixture. For example it can be expressed as molar fraction, volume fraction, mass fraction, molality, molarity or normality. 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, unlocker mouse trap walmart 33647 the amount of the unlocker mouse trap walmart 33647 can be calculated. Conversely, if one reactant has a known quantity and the quantity of product can be unlocker mouse trap walmart 33647 determined, then the amount of the other reactants can also be calculated. Stoichiometry rests upon the very basic laws that help to understand it better, i. In general, chemical reactions combine in definite ratios of chemicals. Since chemical reactions can neither create nor destroy matter, nor transmute one element into another, the amount of each element must be the same throughout the overall reaction. For example, the number of atoms of a given element X on the reactant side must equal the number of atoms of that element on the product side, whether or not all of those atoms are actually involved in a reaction. The convention is to assign negative coefficients to reactants which are consumed and positive ones to products. However, any reaction may be viewed as going in the reverse direction, and all the coefficients then change sign as does the free energy.



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