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Calculate the percentage by mass of oxygen in the following compounds:
(a) Morphine, C17H19NO3
(b) Codeine, C18H21NO3
(c) Cocaine, C17H21NO4
(d) Tetracycline, C22H24N2O8
(e) Digitoxin, C41H64O13
(f) Vancomycin, C66H75Cl2N9O24.
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