A portable CD player that draws 160 milliamperes of current is powered by Ni-Cd rechargable batteries. Compute the mass of Cd consumed when a disk is played for 35 minutes. (enter your answer in grams)

Answer 1

time in seconds is
35 min x (60 seconds/min) = ?
amperes = 160 mA = 0.160 A.
Calculate Q = # coulombs = amperes x seconds.

Then you know that 96,485 coulombs will deposit 112.4/2 grams Cd (that's molar mass Cd/valence).
(112.4/2)g Cd x ?coulombs from above/96,485 = ?