4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H⁺ ions in solution by the same quantity of electric charge will be :

Question

Dr. Abubacker · Accepted Answer

[Solution from source] 4.5 g Al = 1/6 mol; Al³⁺ needs 3 F per mol, so charge = 0.5 F. 0.5 F liberates 0.25 mol H₂ (2 F per mol H₂) = 0.25 × 22.4 = 5.6 L at STP. 11.2 L forgets that H₂ needs two electrons per molecule. Answer (3).

Q. 4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H⁺ ions in solution by the same quantity of electric charge will be :

Explanation

Reviewed by Dr. Abubacker

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