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molar mass of oxygen is 16g/mol.
There are 30 oxygen moles inside 1mol of the compound `Al_2(SO_4)_3·18H_2O`
Mass of Oxygen in the compound `= 30xx16 = 480g`
Mass % of oxygen `= 480/666.43xx100% = 72%.`
So mass percentage of oxygen in `Al_2(SO_4)_3·18H_2O` is 72%.
The correct answer is at D)
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