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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=2.5
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B
Percentage w/v=17
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C
Mole fraction of H2O2=0.2
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D
Molality of H2O2=13.88
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Solution

The correct options are
A Molarity of H2O2=2.5
C Mole fraction of H2O2=0.2
D Molality of H2O2=13.88
Volume strength is 28. Molarity is volume strength11.2=2811.2=2.5.

Percentage w/v is volume strength×6822.4=28×68224=8.5.

1 L of solution contains 2.5 moles of hydrogen peroxide.

Number of moles of water =265g/L×1L2.5mol×34g/mol18=10 moles

Mole fraction of hydrogen peroxide =2.510+2.5=0.2

Molality =2.50.180=13.88

Thus options A, C and D are correct.

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