Amount of Substances: Definitions

Question 1

Relative Atomic Mass

Answer 1

• The average mass of an atom of an element relative to the mass of 1/12 of a carbon-12 atom

Question 2

Relative Molecular Mass

Answer 2

• The average mass of a molecule relative to the mass of 1/12 of a carbon-12 atom

Question 3

Mole

Answer 3

• The unit of amount of substance
• One mole is equal to 6.022 x 10^23 particles (the Avogadro constant)
• A mole is the amount of substance that contains the same number of atoms or particles as 12 g of carbon-12

Question 4

Empirical Formula

Answer 4

• The simplest whole number ratio of atoms of each element in a compound

Question 5

Molecular Formula

Answer 5

• Molecular formula is the actual number of atoms of each element in a compound