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What is the molarity of the solution obtained by mixing 50 mL of concentrated H2SO4 (18 M) with 50 mL of water (assume volumes are additive)?

1. 36 M
2. 18 M
3. 9 M
4. 6 M

Correct answer: 9 M

Solution

Moles of H2SO4 stay constant while the volume doubles, so the molarity halves from 18 M to 9 M.

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