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The number of parts by mass of a substance that combines with or displaces 1.008. parts by mass of hydrogen or 8.0. parts of oxygen or 35.5. parts of chlorine is called its equivalent mass (EM).
Equivalent weight is the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance. The equivalent weight of an element is the mass which combines with or displaces 1.008 gram of hydrogen or 8.0 grams of oxygen or 35.5 grams of chlorine