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6.02 × 10^20 molecules of urea are present in 100 mL of its solution. The concentration of solution is:

1. 0.01 M
2. 0.001 M
3. 0.1 M
4. 0.02 M

Correct answer: 0.001 M

Solution

The number of moles is obtained by dividing the given molecules by Avogadro's number. Molarity is then calculated using the solution volume.

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