Question

What is difference between molecular weight and equivalent weight?

Answer 1

Equivalent weights may be calculated from molar masses if the chemistry of the substance is well known: sulfuric acid has a molar mass of 98.078(5) g mol−1, and supplies two moles of hydrogen ions per mole of sulfuric acid, so its equivalent weight is 98.078(5) g mol−1/2 eq mol−1 = 49.039(3) g eq−1

Answer 2

The equivalent weight of a substance is the number of parts by weight of the substance that combine or displaces one part by weight of hydrogen or 8 part by weight of oxygen or 35.5 parts by weight of chlorine. Formula Mass: As molecular mass is for molecules and compounds formula mass is for ionic compounds specially.