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a) 9.74mg = 0.00974g -> (dividiendo entre el peso molecular) 0.00974g/(137.34g/mol)=7.092*10^-5 mol
ahora necesitamos saber cuantos miligramos de cobre corresponden a esas moles.
7.092*10^-5 mol* 63.54g/mol * 1000mg/g = 4.506 mg