A student electroplates copper from 0.50 M CuSO4 onto a clean copper cathode. A constant current of 0.500 A is passed for 30.0 min. The cathode is dried and reweighed; the mass increases by 0.296 g. F = 96,485 C/mol e-. M(Cu) = 63.55 g/mol.
If the same charge had instead deposited Ag from AgNO3, what mass of silver would be deposited? (M(Ag) = 107.87 g/mol)
- Acheck_circle
1.006 g
- B
0.503 g
- C
0.296 g
- D
0.148 g
Explanation
Ag+ + e- -> Ag. mol Ag = mol e- = 9.328e-3. mass = 9.328e-3 * 107.87 = 1.006 g.