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10 mL of 1 mM surfactant solution forms a monolayer covering 0.24 cm 2 on a polar substrate. If the polar head is approximated as a cube, what is its edge length?

1. 2.0 nm
2. 0.1 nm
3. 2.0 pm
4. 1.0 pm

Correct answer: 2.0 pm

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