This question is about different forms of carbon - AQA - GCSE Chemistry - Question 3 - 2022 - Paper 1

The melting point of diamond is very high due to the strong covalent bonds that hold the carbon atoms together. Breaking these numerous bonds requires a significant amount of energy, thus resulting in a high melting point.

Fullerene.

The C₇₀ molecule is hollow, which allows it to act as a cage, trapping drugs and enabling their movement around the body.

The calculation is based on the number of carbon atoms in one mole:

$\text{(moles of C₇₀ molecules)} = \frac{1}{70} \approx 0.0142857$

Now, multiplying by Avogadro's number:

$\text{(molecules)} = 0.0142857 \times 6.02 \times 10^{23}$

This gives approximately:

$\approx 8.6 \times 10^{21}$