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The thickness of the crust ranges between about 20 and 120 km.Crust on the far side of the Moon averages about 12 km thicker than that on the near side.Stoichiometry rests upon the very basic laws that help to understand it better, i.e., law of conservation of mass, the law of definite proportions (i.e., the law of constant composition), the law of multiple proportions and the law of reciprocal proportions.In general, chemical reactions combine in definite ratios of chemicals.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.
As the Moon formed, the outer part of it is thought to have been molten, a “lunar magma ocean.” Plagioclase feldspar crystallized in large amounts from this magma ocean and floated toward the surface. The upper part of the crust probably averages about 88% plagioclase (near the lower limit of 90% defined for anorthosite): the lower part of the crust may contain a higher percentage of ferromagnesian minerals such as the pyroxenes and olivine, but even that lower part probably averages about 78% plagioclase. The underlying mantle is denser and olivine-rich.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).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.
Whether a reaction actually will go in the arbitrarily selected forward direction or not depends on the amounts of the substances present at any given time, which determines the kinetics and thermodynamics, i.e., whether equilibrium lies to the right or the left. k occur whenever the first of the reactants is depleted for the forward reaction; or the first of the "products" is depleted if the reaction as viewed as being pushed in the reverse direction.