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Question:

If the diameter of a carbon atom is 0.15 nm, calculate the number of carbon atoms which can be placed side by side in a straight line across length of scale of length 20 cm long.

Solution:

The diameter of 1 C atom is 0.15 nm = 0.15 × 10⁻⁷ cm. In 20 cm length, 20 / (0.15 × 10⁻⁷) = 1.33 × 10⁹ carbon atoms can be placed.