What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?

[ F = 96 5000 C mol-1 ]

  • A 24 125 coulombs
  • B 48 250 coulombs
  • C 72 375 coulombs
  • D 96 500 coulombs
jamb 1999chemistry

The correct answer is B. 48 250 coulombs

4 Faradays of electricity is required to liberate one mole of oxygen gas

∴ quantity of electricity required

= 0.125 * 4 * 96500 = 48250 coulombs

Previous question Next question