Now total content of cylindrical container is placed in spherical container and if it is further filled completely with 32.4% w / v HBr solution. Molarity of H + in final solution-

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Initial Content: The cylindrical container contains $4 m o l es$ of H⁺ from the previous step of the comprehension.

Moles from HBr: To completely fill the setup, $1000 m L$ of $32.4% w / v H B r$ solution is added, which contributes $\frac{32.4 \times 10}{81} = 4 moles$ of H⁺.

Total Moles: The total amount of H⁺ ions in the final mixture is $4 + 4 = 8 moles$ .

Final Molarity: Since the total volume of the combined solutions equals $4 L$ , the final molarity is $M = \frac{8 m o l es}{4 L} = 2 M$ (Option B).

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