A bottle of an aqueous H2O2 solution is labelled as ′28V′H2O2 and the density of the solution in g/mL is 1.335. Choose the correct option.
Molality of H2O2 solution is 5
Molality of H2O2 solution is 2
Molality of H2O2 solution is 4
None of these
The correct option is B Molality of H2O2 solution is 2 ∴Molarity=Given volume strength11.2 M=2811.2=2.5M Density(d)=mass(m)Volume(v) As 1000mL of solution contain 2.5 mole of H2O2. Massofsolution=d×v massofsolution=1.335g/mL×1000mL ⇒massofH2O2=Moles×molarmassofH2O2 =2.5mole×34g/mole = 85g ∴Molality=molesofsoluteweightofsolvent×1000 Molality=2.51335−85×1000 Molality=2m