What is the charge carried by electrons as 0.120 mole of Cr(s) is oxidized to Cr3+(aq)?
mols Cr = 0.120
mols electrons = 3x that = 0.36 mol
0.36 mol x 6.02E23/mol = ?
charge on electron = 1.6E-19 coulombs/mol.
1.6E-19 x ? #electrons = total charge.