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`Al_(2)(SO_(4))_(3).XH_(2)O` has `8.1%` aluminium by mass. The value of `X` is:

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`Al_(2)(SO_(4))_(3).XH_(2)O` has `8.1%` aluminium by mass. The value of `X` is:
A. `4`
B. `10`
C. `16`
D. `18`
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Correct Answer - D
`:. 100 g` atom has `Al=8.1`
`:. 342+18x g` compound has `54 g Al`
`:. 100 g` compound has `(54xx100)/(342+18 x)`
`=8.1`
`:. X=18`
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