During the preparation of per sulfuric acid O2 gas is also released as by product when 9.72 litres of H2 releases at cathode and 2.35 litres of o2 at STP the weight of per disulphuric acid produced in grams is

Dear student

 

I am getting my answer as-

Weight of per disulphuric acid (H2S2O8) is 43.56 gm

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Arun (askIITians forum expert)

Solution 
Equivalent of H2,9208 + Equivalent of 02 (at anode) = Equivalent of 112 (at cathode)
Eq. of H₂ = ( Volume released / Equivalent Volume)
                 = (9.72 /11.2)  =  0.87
 Eq. of 0₂ = ( 2.35 / 5.6)  =  0.42 
Wt. of H₂S₂O₈ = g - eq x eq . wt = 0.45 x  (mol.wt / 2)
                                                     = (0.45 *194) / 2  
                                                     = 43.65