Question

if sample(aluminium ammonium sulphate contains 6%aluminium) what is the approximate percentage of aluminium?
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The formula for aluminum ammonium sulfate, which is a hydrate, is

AlNH4SO4*12H2O

You need to know that to answer the problem.

The atomic weights add up to
27 + 18 + 32 + 64 + (12x18) = 357

Alumimum is only 27 of that total

27/357 = 7.6 % is the answer

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