Chemical Equations Weight Relationships And Conservation Of Mass And Charge

A fundamental rule that must be observed at all times is that expressions of chemical reactions become equations only when they are balanced. Mass must be conserved; that is, the total number of each kind of atom must be the same on both sides of the equation. Also, the sum of the charge on one side of the equation must equal that on the other. In order to balance a chemical equation, it is essential that it represent a reaction in true manner, and all formulas used must be correct. Unless these conditions are complied with, weight relationships are meaningless. Weight relationships serve as the basis for the sizing of chemical feeding equipment, necessary storage space for chemicals, structural design, and cost estimates in engineering considerations. Their importance should not need further emphasis.

EXAMPLE 2.3

18 g of H20, 2 mol or 117 g öf NaCl, and 1 mol or 44 g of CO,'

18 g of H20, 2 mol or 117 g öf NaCl, and 1 mol or 44 g of CO,'

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