Giant covalent structures
2 marks · EasyC60 fullerene contains 60 carbon atoms. If each carbon atom forms 3 bonds, calculate the total number of covalent bonds in one C60 molecule.
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Show answer
90 (±0)
Common mistakes: Multiplying 60 x 3 then not dividing by 2
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Shows 60 × 3 = 180 bonds counted (each carbon forms 3 bonds).
A1 · 1 mark · Divides by 2 to avoid double-counting, total = 90 bonds.
Worked solution
Each bond is shared by two atoms, so divide by 2:
There are 90 covalent bonds in one C60 molecule.