Calculate percentage of oxygen AL2 (SO4)3 molar number values are Al27 O16 S 32
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Thus, the molar mass of aluminum sulfate = 2 x 27 + 3 x 32 + 4 x 3 x 16
= 342 gm/mole
The mass contributed by oxygen = 4 x 3 x 16 = 192 gm
% contribution of oxygen = mass of oxygen x 100/ mass of aluminum sulfate
= 192/342 x 100 = 56.14
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