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If the quantity of any substance is characterized by its mass, then the kilomole as a unit of the quantity of matter will have different sizes for different substances.
If the quantity of a substance is assumed to be the number of molecules contained in it, and since this number changes in the case of reactions of disintegration or synthesis in a closed system, the amount of matter will change according to the above definition, and this contradicts the basic law of the conservation of matter. Thus, also in this case the kilomole cannot be accepted as a unit of the quantity of matter.
If the problem of establishing a nonsystem unit is considered, it is then advisable to introduce a unit of mass equal to 1/12 of the mass of a nuclide of12C, which is the base of the atomic mass scale.
Thus, although the kilomole is convenient for chemical computations entailing the mass of substances (in kilograms), nevertheless, it has different sizes for different substances (nuclides) and, therefore, it cannot be considered as a unit of any system of units, including the SI.
KeywordsPhysical Chemistry Analytical Chemistry Closed System Mass Scale Chemical Computation
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