CHEMISTRY · Single correct · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry
Problem
Cell A contains molten NaCl, and Cell B contains molten PbCl₂. The two cells are connected in parallel to a constant-voltage source. The resistance of Cell A is exactly twice the resistance of Cell B. Which statement best describes the metal deposits after 15.0 min of electrolysis?
(a) Cell B deposits roughly twice the mass of metal as Cell A because it carries twice the current.
(b) Cell A deposits the greater mass of metal because sodium requires only one electron per atom, so the charge is used more efficiently.
(c) Cell B deposits roughly nine times as much mass of metal as Cell A because it carries twice the current and requires twice as many electrons per mole of metal.
(d) Both cells deposit equal masses of metal because the same potential difference is applied to each branch.