Aluminum sulfate can be used in water purification by weighing some measurement. The measurement to that is [tex]342.3[/tex]amu.
Formula weight = 2×27+3×(32.1+4×16)
[tex]\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 &=[/tex] 342.30amu
As a result, aluminum sulfate can be used to purify water. The formula weight for this salt is 34.30amu. The final answer is (a).
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