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  4. A certain metal sulphide, Ms2 is used extensively as a high temperature lubricant. If Ms2 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

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Solution:

$ \underset{100}{\mathop{\underset{M+64}{\mathop{M{{S}_{2}}}}\,}}\,\equiv \underset{\begin{smallmatrix} 64 \\ 40.06 \end{smallmatrix}}{\mathop{2S}}\, $ $ \frac{M+64}{100}=\frac{60}{40.06} $ $ M=96 $