Quantitative Aspects of Chemical Change

Question 1

One Mole

Answer 1

One Mole is the amount of substance having the same number of particles as there are atoms in 12 g carbon-12.

Question 2

Relative Atomic Mass

Answer 2

Relative Atomic Mass is the mass of a particle on a scale where an atom of carbon-12 has a mass of 12.

Question 3

Describe Avogadro’s Number

Answer 3

Avogadro’s number, NA, is the number of particles (atoms, molecules, formula units) present in mole (NA = 6,023 x 1023 mol-1).

Question 4

Molar Mass

Answer 4

Molar Mass is the mass of one mole of a substance measured in g·mol-1.

Question 5

Empirical Formula

Answer 5

Empirical formula as the simplest whole-number ratio of atoms in a compound.

Question 6

Water of Crystallisation

Answer 6

Water of Crystallisation is water that is stoichiometrically bound into a crystal, e.g. the H2O in CuSO4·5H2O.

Question 7

Concentration

Answer 7

Concentration is the number of moles of solute per cubic decimetre of solution.

Question 8

Avogadro’s Law

Answer 8

Avogadro’s law states that one mole of any gas occupies the same volume at the same temperature and pressure.