Question

You have 20 g of a buckyball (C20).

How many moles do you have?

Responses

0.08 mol

0.08 mol

0.16 mol

0.16 mol

1.00 mol

1.00 mol

1.70 mol

Answer 1

Moles = mass / molar mass. Molar mass of C20 ≈ 20 × 12.01 = 240.2 g·mol⁻¹.

So n = 20 g / 240.2 g·mol⁻¹ ≈ 0.0833 mol ≈ 0.08 mol.