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Question

A sample of H2O2 solution labelled as "28 volume" has density of 265 g/L. Mark the correct option(s) representing concentration of same solution in other units:

A
Molarity of H2O2 (MH2O2)=2.5
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B
%wv=17
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C
Mole fraction of H2O2=0.2
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D
Molality of H2O2 (mH2O2)=13.88
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Solution

The correct option is D Molality of H2O2 (mH2O2)=13.88
Given,
Molarity=volume strength11.2=2811.2=2.5 M
1 L contain 2.5 moles of H2O2
Mass of H2O2 in 1 L solution (wH2O2)=2.5×34 g=85 g H2O2
Given, density of the solution (d)=265 g/L
Therefore weight of 1 litre solution=265 g
wH2O=26585 g=180 g H2O=10 mol
xH2O2=2.52.5+10=0.2
%wv=2.5×341000×100=8.5
mH2O2=2.5180×1000=13.88 m

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