Question

what volume of oxygen measured at stp would be liberated on electrolysis by 9650 colombus of electricity

Answer 1

Answer:

Electrolysis of dilute sodium hydroxide is actually the electrolysis of water liberating oxygen gas at the anode. Sodium hydroxide just makes the water a good conductor of electricity. Four (4) moles of electrons is needed when liberating 1 mole of oxygen gas (O2). One (1) mole of oxygen gas has a volume of 22.4 liters at STP.

What is the volume of oxygen gas liberated by 9650 coulombs of electricity? One Faraday of electricity is equivalent to 96,485 coulombs so 9650 coulombs is equal to 0.100 Faraday. Since 4 moles of electrons is needed to liberate one mole of O2 gas 9650 coulombs can only liberate 0.100/4 moles of O2 gas.

This amount of O2 gas is 0.025 moles and when converted to liters gives 2.24/4 liters which when simplified is 0.56 liters at STP.