Question

How to find equivalent mass of an atom.

Answer 1

Equivalent mass of an atom can be said as the ratio of the atomic mass to its valency.
í.e.

$equivalent \: \: mass = \frac{atomic \: \: mass}{vaency}$
In case if we dont know the valency then,

For metallic oxides,

$equivalent \: \: mass = \frac{mass \: \: of \: \: metal \: \: \times 8 }{mass \: of \: \: oxygen \: \: in \: \: oxide}$
Else

For chlorides,

$equivalent \: \: mass = \frac{mass \: \: of \: \: the \: \: metal \times 35.5}{mass \: \: of \: \: chlorine \: \: in \: \: chlorides}$
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Answer 2

It is easy to find equivalent mass for these compounds.divide the molar mass for these compounds by the valency of the element