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  4. An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is 20 % by weight?

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Q. An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is $20\%$ by weight?

WBJEEWBJEE 2008Some Basic Concepts of Chemistry

Solution:

Given that, oxygen contents in element oxide is $20\%$ by weight.
Hence, element contents in element oxide is $80\%$ by weight.
Then, equivalent weight of unknown element
$=\frac{80}{20}\times 8$
$\therefore $ Equivalent weight of unknown element $=32$