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What is the mass percent of oxygen in aluminum sulfate, Al2(SO4)3? The atomic masses are: Al, 26.98; S, 32.07; O, 16.00 (a) 0.2132 % (b) 52.01 % (c) 56.11 % (d) 21.32 % (e) 45.70 % Please help me to solve this question. Thank you!