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The advantages for writing a chemical equation using formula and symbols are
Example : Ammonia gas is formed by the combination of nitrogen and hydrogen.
The above equation expresses :
(a) That nitrogen combines with hydrogen to form ammonia.
(b) That one molecule of nitrogen combines with three molecules of hydrogen to form two molecules of ammonia.
(c) That 28 parts by weight of nitrogen has combined with 6 parts by weight of hydrogen to form 34 parts by weight of ammonia.
(d) One volume of nitrogen and three volumes of hydrogen combine together to give 2 volumes of ammonia gas.



