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Question

Calculate the mass and volume of oxygen at STP, which will be evolved on electrolysis of 1 mole (18g) of water. 
 


Solution

Electrolysis of water will break it down in its component as Hydrogen and Oxygen
Balanced chemical reaction:
2H2O2H2+O2
From the above equation,2 moles of water will evolve 1 mole of oxygen gas upon electrolysis. Therefore 1 mole of water will produce 1 halfmole of Oxygen.
Mass of Oxygen evolved = number of moles of Oxygen evolved ×  Molecular wt. of Oxygen
 =1 half×  32  = 16 g
At STP 1 mole of any gas will occupy 22.4L volume.
Volume of Oxygen evolved = no.of moles ×  22.4L
 = 1 half ×  22.4L = 11.2L


Chemistry
Concise Chemistry
Standard X

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