volume strength of 1.5 N H2O2 solution is?and how plz give proper explanation

Volume strength (or volume percent) is an outdated term referring to the volume of oxygen gas liberated from one volume of H2O2 solution (at 0^oC and 1 atm.).

For example: If the volume strength is given as 20-volumes, it means that 1cm³ of H₂O₂ will produce 20cm³ of oxygen gas.

2 H₂O₂   -----> 2 H₂O  +  O₂ 

2 moles of H₂O₂  ------->    22.4 L oxygen at STP .

Now

It is given that Normality of H₂O₂ = 1.5 N

Moilarity of H₂O₂ = 0.75 M ( n-factor for H2O2 = 2 and N= nM) 

So, in 1 L H2O2 solution , there are 0.75 moles of H2O2

2 moles  of H₂O₂  give  22.4 L O₂ at STP 

So, 0.75 moles (1 L of the given H2O2 soln) will give (22.4*0.75 / 2  ) L of Oxygen

Volume strength = 0.75*22.4 / 2 = 0.75*11.2  = 8.4 L