  # A: 30% solution of H2O2 is marketed as 100 volume hydrogen peroxide. R: 1ml of 30% H2O2 solution will give 100 ml of oxygen at STP. Why is this not the correct explanation?

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Updated on: September 13th, 2023 Given

A: 30% solution of H2O2 is marketed as 100 volume hydrogen peroxide.

R: 1ml of 30% H2O2 solution will give 100 ml of oxygen at STP.

We know that

2H2O2(I) –> O2(g) + H2O(I)

Here 100 volume solution of H2O2 refers to that 1 L of H2O2 solution will provide 100 L of O2 at STP

2H2O2 –> H2O(I) + O2(g)

68 g 22.4 of O2 at STP

0 g 100 L of O2 at STP

Table of content Here x g of H2O2 will provide 100 L of O2 at STP

So we get

(68 x 100)/ 22.4 = 303.57 g of H2O2

As strength of H2O2 = 303.57 g/L = 30.357%

Reason –

1ml of 30% H2O2 solution will give 100 ml of oxygen at STP.

So 68g of H2O2 solution will give 22400 ml of oxygen at STP.

0.3 g of H2O2 solution will give 100 ml of oxygen at STP.

The commercially marketed sample is 10V which refers to that the sample has 3% of H2O2.

Therefore, the assertion is correct but the reason is incorrect.

Summary:

## R: 1ml of 30% H2O2 solution will give 100 ml of oxygen at STP. Why is this not the correct explanation?

A: 30% solution of H2O2 is marketed as 100 volume hydrogen peroxide.

R: 1ml of 30% H2O2 solution will give 100 ml of oxygen at STP.

The assertion is correct but the reason is incorrect.

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