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datos: I = 5A ; t = 4min = 4(60) = 240 seg
reemplazando: Q = (5A)(240s) = 1200C
Además: Q = ne → n = Q/e ; donde: Q = 1200C ; e = 1.6x10^-19C
reemplazando: e = 750 x 10^19 = 7,5 x 10^21 electrones
saludos