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  4. A certain metal sulphide, M S2, is used extensively as a high temperature lubricant. If M S2 is 40.06 % by mass sulphur, metal M has atomic mass

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Q. A certain metal sulphide, $M S_2$, is used extensively as a high temperature lubricant. If $M S_2$ is $40.06 \%$ by mass sulphur, metal $M$ has atomic mass

Some Basic Concepts of Chemistry

Solution:

$M S_2=M+32 \times 2 $
$=M+64$
$\%$ of sulphur $=\left(\frac{64}{M+64}\right) \times 100=40.06$
$\therefore M+64=\frac{6400}{40.06}$
$M+64=160$
$M=160-64=96$