The volume of oxygen gas evolved at STP by decomposition of 0.68 g '20 volume' hydrogen peroxide is:

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The volume of oxygen gas evolved at STP by decomposition of 0.68 g '20 volume' hydrogen peroxide is:

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Solution: The answer is 224 mL

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In a book that has the question, has given the answer as 13.6mL.
So, are they right? Anyway?
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