Reactions and Stoichiometry

Question 1

Relative molecular mass

Answer 1

Average mass of one molecule of a substance relative to 1/12 the mass of a carbon-12 atom

Question 2

Relative formula mass

Answer 2

Average mass of one formula unit of a substance relative to 1/12 the mass of a carbon-12 atom

(used for ionic compounds)

Question 3

Empirical formula

Answer 3

The simplest formula which shows the ratio of the atoms of the different elements in the compound

Question 4

Molecular formula

Answer 4

The formula which shows the actual number of atoms of each element in one molecule of the compound

Question 5

Relative atomic mass

Answer 5

Average mass of one atom of an element relative to 1/12 the mass of a carbon-12 atom

Question 6

Relative isotopic mass

Answer 6

Mass of one atom of an isotope of an element relative to 1/12 the mass of a carbon-12 atom