Practical chemical calculations:

In the discussion of chemical equations, emphasis is generally placed on the number of atoms or molecules included in the reaction.  Therefore, chemical equations are extremely effective in representing chemical reactions on a macroscopic scale. Practical chemical calculations include extremely huge numbers of atoms and molecules.

The equation weight in grams of a compound or element is described as the gram molecular weight times the number of molecules of the compound, as displays through the coefficients of the chemical equation for the reaction. A sum of the equation weights on every side of a chemical equation must be equal. Chemical calculations are based on the fact that each fraction or multiple of the equation weights of substances which react provides a corresponding fraction or multiple of the equation weights of the products of the reaction. Another words, if 30 grams of a substance which has an equation weight of 15 grams reacts along with a few amount of another substance to form a product along with an equation weight of 20 grams, then 40 grams of which product will be established.