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Ar Al = 27
Ar H = 1
Ar O = 16
Ar S = 32
Mr KAl(SO₄)₂.12H₂O
= Ar K + Ar Al + 2.Ar S + 20.Ar O + 24.Ar H
= 39 + 27 + 64 + 320 + 24
= 474 gr/mol