A mixture of hydrogen and oxygen is evolved when a dilute solution of NaOH is electrolysed. How many moles of each gas would be liberated by a current which deposited 20.942 of Ag ?

Explanation

1 mole (faraday) electric yields 1 equivalent of matter.
`therefore` equivalent of Ag `= (20.942)/(108)`
`therefore` mole of electric charge `= (20942)/(108)` faraday.
Since the same amount of electricity is passed through diliute NaOH solution,
equivalent of hydrogen liberated `= (20.942)(108)`
and equivalent of oxygen liberated `= (20.942)/(108)`
`{:(therefore " mole of " H_(2) " liberated " = (20.942)/(108) xx (1)/(2) = 0.97),(" mole of " O_(2) " liberated " = (20.942)/(108) xx (1)/(4) = 0.0485):}}`