Question:
The molarity of pure water is
The molarity of pure water is
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$1000 / 18 = 55.55$. Keep this constant in mind for aqueous solutions.
Updated On: May 14, 2026
- 1
- 18
- 55.55
- 54
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Molarity is defined as the number of moles of solute per liter of solution.
Step 2: Calculation
1 Liter of water weighs 1000g. The molecular weight of $H_2O$ is 18.015 g/mol. Moles = $1000g / 18.015g/mol \approx 55.508$ mol.
Step 3: Analysis
For pure water, the "solute" and "solution" are the same substance, occupying exactly 1 liter.
Step 4: Conclusion
The concentration of pure water is 55.55 M. Final Answer: (C)
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