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

$\begin{array}{1 1} 16 \\ 32 \\ 8 \\ 64 \end{array}$
Can you answer this question?

Let the total amount of oxide be 100
$\therefore$ mass of oxygen is 20
$\therefore$ mass of element is (100-20)=80
$\therefore$ equivalent mass of element=$\large\frac{mass\;of\;element}{mass\;of\;oxygen}$$\times 8 \qquad\qquad\qquad\qquad\qquad=\large\frac{80}{20}$$\times 8$
$\qquad\qquad\qquad\qquad\qquad=32$
Hence (b) is the correct option.
answered Oct 22, 2013