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Introduction of Stoichiometry

A branch of chemistry that deals with the relative quantities of reactants and products in chemical reactions is known as Stoichiometry. The relations among quantities of products and reactants typically form a ratio of whole numbers in balanced chemical reaction. For an instance, in a reaction that forms ammonia (NH3), to produce two molecules of NH3 exactly one molecule of nitrogen (N2) reacts with three molecules of hydrogen (H2).

That is defined in the following equation:

N2 + 3H2 → 2NH3

To find quantities like the amount of products (in mass, volume, moles, etc.) that can be produced with given reactants and percent yield the Stoichiometry can be used. How elements and components that are diluted in standard solution react in experimental conditions can be predicted by Stoichiometry calculations. It is founded on the law of conservation of mass: the mass of the reactants equivalent to the mass of the products.

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The quantitative relationships between the substances are explained in the Reaction Stoichiometry, because in chemical reactions they had been participated. In the case that is defined above, the 1:3:2 ratio of molecules of nitrogen and hydrogen and ammonia are described by the reaction Stoichiometry.

The quantitative (mass) relationships between the elements in compounds Composition is described in Stoichiometry. For an instance, the nitrogen to hydrogen ratio in the compound ammonia described in the composition Stoichiometry: 1 molecule of ammonia contains 1 molecule of nitrogen and 3 molecules of hydrogen. Than the hydrogen atom, a nitrogen atom is about 14 times heavier, mass ratio is 14:3, so the ammonia of 17 kg contains 3 kg of hydrogen and 14 kg of nitrogen.

A reagent's stoichiometric amount or stoichiometric ratio is the optimum amount or ratio where assuming that the reaction continues to completion:

1.  There is no shortfall of reagent,

2.  All of the reagents are consumed,

3.  There is no excess of the reagent.

A non-stoichiometric mixture, where reaction has gone to completion will have only the limiting reagent that is consumed completely.

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