An aqueous solution of hydrogen peroxide has a molarity of 1.5 M . Assuming standard conditions ( 0 ∘ C and 1 atm ), what is its volume strength? (Round to the nearest integer).

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The decomposition of hydrogen peroxide is $2 H_{2} O_{2} (a q) \to 2 H_{2} O (l) + O_{2} (g)$ . From stoichiometry, 2 moles of H₂O₂ produce 1 mole of O₂. At STP ( $0^{0}$ and $1 a t m$ ), 1 mole of O₂ occupies $22.4 L$ .

Therefore, 1 mole of H₂O₂ produces $0.5 \times 22.4 L = 11.2 L$ of O₂.

For a $1.5 M$ solution, $1.5 m o l es$ of H₂O₂ are in $1 L$ of solution. The volume strength is $1.5 \times 11.2 L = 16.8 L$ . Rounding to the nearest integer gives $17$ .

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