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The formula for aluminium sulfate is the mass of 2 aluminuum atom and the mass of 3 sulfur atoms and the mass of 12 oxygen atom. Mass of 2 Al atoms=27*2=54 Mass of 3 sulfur atoms=32*3=98 Mass of 12 oxygen atoms=16*12=192 mass ofAl2(SO4)3=54+98+192=344u
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