NCERT Class XI Chemistry Structure of Atom Solutions

Question : 35

Total: 67

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:

A carbon atom covers length = diameter of atom = 0.15 nm
= 0.15 × 10–9 × 102 cm = 0.15 × 10–7 cm
∴ Number of carbon atoms which can be placed on 20 cm length
=

0.15×10−7

= 1.33 × 109

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