Quantity of the substances associated Quantity of substance Association is a relationship between the mass or weight of the elements of a compound in a chemical reaction volume substances associated with benefits in terms of the quantity of the substance that the prognosis must be used as a precursor to achieve the desired product. The system opens a closed system.System (System) means a thing which exists in the boundary study.Open systems (Open System) refers to a system that has a mass transfer of substances between the environment or system. Where the mass and energy of the substance before the change and after the change are not fixed, such as:
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