Electrolysis of water
From electrolysis of water, L of oxygen gas was generated at STP. What are the mass of the decomposed water and the volume of the hydrogen generated at STP? (The atomic weights of hydrogen and oxygen are and respectively.)
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1 solution
The chemical reaction is electrolysis of water 2H2O ----> 2H2 + O2 Given that 1.12 liter ( 1.12/22.4 mole) of Oxygen was generated, therefore, from the equation, we know that 2 moles of water generates 2 moles of Hydrogen and 1 mole of water. The ratio of hydrogen to water is 2:1. Therefore, the volume of of generated hydrogen is twice the amount or 2 x 1.12L = 2.24 L. Now calculate the atomic weight for (1.12/22.4) mole of water. 1 mole of water contains 36 g of H2O. In 0.05 mole, it contains 0.05 x 36= 1.8 g.