The negative Zn pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13g in 30minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is
(a) 0.180g
(b) 0.141g
(c) 0.126g
(d) 0.242g.
