The molar mass of Calcium is 40 g/mol Thus, 8 g of Ca correspond to n(ca) = mCa)/M(Ca) = 8 g / 40 g/mol = 0.2 mol of Ca. One Ca++ ion has 2 charges, so 0.2 mol of Ca++ contain 0.4 mol of charges. One mol of charges contain 96485 coulombs, so 0.4 mol contain n(Ca++) * F = 0.4*96485 = 38594 C. (F = Faraday constant is the magnitude of electric charge per mole of electrons, F = 96485 C/mol)
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