Question

Difference between equivalent mass and molecular mass

Answer 1

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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.

The molecular mass is the mass of a given molecule: it is measured in unified atomic mass units. Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element.