How many oxygen atoms are there in [k2SO4Al2(SO4)3.24H2O
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Explanation:
Since sulfur is less electronegative than oxygen, the oxygen has an oxidation number of -2; 4 atoms of oxygen give a total negative charge of -8, and the sulfur atom must have an oxidation number of +6 to match the -2 charge of the sulfate ion as a whole.
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