Aluminum sulfide is just aluminum and sulfur, while aluminum
sulfate is Aluminum plus Sulfate (Polyatomic ion made of sulfur and
oxygen)
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the percentage composition of aluminum sulfate is 342
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The reaction forms aluminum sulfate and frees copper.
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1 formula unit of aluminum sulfate has the formula Al2(SO4)3. So
there are 2 atoms of aluminum, 3 atoms of sulfur and 12 atoms of
oxygen in 1 formula unit of aluminum sulfate. There are no
molecules of aluminum sulfate. They are called formula units.
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Alum is the common name for aluminum potassium sulfate or aluminum sulfate.