CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
The mole is a unit of amount of substance defined using the Avogadro constant.
Compare the number of atoms in one mole of helium gas, He, with the number of atoms in one mole of carbon dioxide gas, . Use the Avogadro constant in your explanation.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.