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Question

Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen according to the equation:
2H2O2(aq)2H2O()+O2(g)
Under conditions, where 1 mole of gas occupies 24dm3, 100cm3 of x M solution of H2O2 produces 3dm3 of O2. Thus, x is:

A
2.5
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B
1
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C
0.5
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D
0.25
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Solution

The correct option is C 2.5
2 moles of H2O2 produces 1 mole of O2.
At particular conditions, 1 mole of O2 occupies 24 dm3.
So, 3 dm3=324=0.125 moles of O2
This is produced in 100 cm3 =0.1 litres amount.
So, molarity =0.125×20.1=2.5

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