| Date | May 2010 | Marks available | 1 | Reference code | 10M.1.SL.TZ1.10 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 10 | Adapted from | N/A |
Question
The mole is defined as
A. \(\frac{1}{{12}}\) the mass of an atom of the isotope carbon-12.
B. the amount of a substance that contains as many elementary entities as the number of atoms in 12 g of the isotope carbon-12.
C. the mass of one atom of the isotope carbon-12.
D. the amount of a substance that contains as many nuclei as the number of nuclei in 12 g of the isotope carbon-12.
Markscheme
B
Examiners report
D was a common distracter indicating that many candidates were unfamiliar with expressions such as ‘a mole of water’ or ‘a mole of marbles’.
