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+//Example19.3//
+
+//The current indicates a flow rate of electrons
+a=10*10^-3;//C/s // coulomb per second
+b=1;//electron
+c=0.16*10^-18;//C //1 Coulomb of charge
+I=a*b/c
+mprintf("I = %e electrons/s",I)
+
+//As the oxidation of each iron atom generates two electrons
+d=1;//reaction
+e=2;//electrons
+r=I*d/e
+mprintf("\nr = %e reaction/s",r)