Question

An Element Forms An Oxide In Which The Oxygen Is 20 % of the oxide by mass, the equivalent mass of the element will be??

Answer 1

1st method:

Let the total amount of oxide be 100

∴ mass of oxygen is 20

∴ mass of element is (100-20)=80

∴ equivalent mass of element=massofelementmassofoxygenmassofelementmassofoxygen×8×8

=8020=8020×8×8

=32

2nd method:

Equivalent mass of a metal is defined as the mass which combines with 8 gram of oxygen or 35.5 grams of chlorine or 1 gram of hydrogen.

Given: Mass of metal oxide = x = 100 g

mass of oxygen =

Thus mass of metal = Mass of metal Oxide - mass of oxygen = (100-20) g= 80 g

20 gram of oxygen combine with = 80 g of metal

So 8 gram of oxygen combines with = of metal

Thus equivalent mass of metal is 32 gram.

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