Mole Concept

Question 1

Relative Isotopic Mass

Answer 1

The relative isotopic mass, Ar, of an isotope is the mass of an atom of the isotope compared to 1/12 the mass of a 12C atom

Question 2

Relative Atomic Mass

Answer 2

The relative atomic mass, Ar, of an element, is the weighted average mass of all the isotopes of the element compared to 1/12 the mass of a 12C atom

Question 3

Relative Molecular Mass

Answer 3

The relative molecular mass, Mr, of an element or compound, is the weighted average mass of a molecule of the element or compound compared to 1/12 the mass of a 12C atom

Question 4

Relative Formula Mass

Answer 4

The relative formula mass, Mr, of a compound, is the weighted average mass of a formula unit of the compound compared to 1/12 the mass of a 12C atom

Question 5

Avogadro’s Constant

Answer 5

One mole contains exactly 6.02 x 10^23 elementary entities

Question 6

Empirical Formula

Answer 6

The empirical formula of a compound is the simplest formula that shows the relative number of atoms of each element present in a compound

Question 7

Molecular Formula

Answer 7

The molecular formula of a compound is the formula that shows the actual number of atoms of each element present in one molecule of a compound