An electric current is passed through silver and water voltameters connected in series. The cathode of the silver voltameter weighed 0.054 ~g more at the end of electrolysis. The volume of O ₂ evolved at the anode of water voltameter is

Step-by-step solution

According to Faraday second law, W_ Ag W_ O ₂ = E_ Ag E_ O ₂ 0.054 W_ O ₂ = 108 8 W_ O ₂ = 0.054 108 8=4 10⁻³ ~g 32 ~g ^ g oxygen ( O ₂ ) at STP liberates 22400 ~cm ³ . 4 10⁻³ g of oxygen will liberate = 4 10⁻³ 22400 32 =28 ~cm ³