Calculate % by mass of H_2O_2 solution that is 67.2 by volume

MHT CET 2025 Chemistry question

Calculate % by mass of HO solution that is 67.2 by volume

(A)13.60% by mass
(B)20.40% by massCorrect
(C)22.44% by mass
(D)17.60% by mass

Answer: (B)

Solution

"67.2 volume" means 1 L of the HO solution liberates 67.2 L of O at STP on decomposition: . Moles of O mol. Moles of HO needed mol, which has mass g. So 1 L (1000 mL) of

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Question ID VK-103142