Question

What is meant by the term `"equivalent mass"`?

Answer 1

This is the mass of an element or compound that contains `"Avogadro's number"` of formula units.......

Explanation:

The term `"equivalent mass"` or `"equivalent weight"` originally referred to the mass of element that would combine (in an integral ratio) with `1.008*g` of hydrogen......

These days equivalent mass is taken as the molar mass, i.e. the mass of `6.022xx10^23` formula units......and these are now all conveniently listed on the Periodic Table.