A metal oxide contains 20% oxygen by weight. find the equivalent weight

An equivalent weight of a solution is defined as the molecular weight of the solute divided by the valence of the solute. Equivalent weight is used for predicting the mass of a substance that reacts with one atom of hydrogen in an acid-base analysis like in titration. Equivalent weight is used in the calculation of normality.

Equivalent Weight
Equivalent weight = molecular weight / X

Where,  X represents the valency factor.


We have to determine the equivalent weight if a metal oxide contains 20% oxygen by weight

equivalent wt. of metal=mass of metal/mass of oxygen×equivalent weight of oxygen

Equivalent weight is that which combines with 8 parts by weight of oxygen.

If 20% mass is of oxygen and the remaining 80% mass is contributed by metal,

Then the equivalent weight of metal = (80/20)*8

= 32

Further Reading

  1. What is the equivalent weight of H3PO4 in the reaction: Ca(OH)2 + H3PO4: CaHPO4 + 2H2O
  2. Number Of Fe Atoms In 100 G Haemoglobin If It Contains 0.33% Fe. (Atomic Mass Of Fe=56).


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