Atoms, Molecules & Stoichiometry

Question 1

Define

relative atomic mass

Answer 1

The weighted average mass of a naaturally ocurring atom of an element relative to the mass of a carbon-12 atom

Question 2

Define

relative isotopic mass

Answer 2

The mass of a naturally occurring isotope of an element relative to the mass of a carbon-12 atom

Question 3

Define

relative molecular mass

Answer 3

The mass of a molecule of a compound relative to a carbon-12 atom

(refers to compounds containing molecules, e.g. CH₄, CO₂)

Question 4

Define

relative formula mass

Answer 4

The mass of a formula unit of a compound relative to the mass of a carbon-12 atom

(refers to compounds containing ions, e.g. MgCl₂, CuSO₄)

Question 5

Define

the mole

Answer 5

The amount of a substance containing the same number of specific particles (atoms, ions or molecules) as there are carbon atoms in 12g of carbon-12, i.e. containing 6.02 x 10²³ particles (the Avogadro constant)