Definitions

Question 1

Define Relative Atomic Mass (Ar).

Answer 1

The average mass of an atom of an element when measured on scale on which the the mass of an atom of carbon-12 is 12.

Question 2

Define Relative Molecular Mass (Mr).

Answer 2

The average mass of a molecule when measured on scale on which the the mass of an atom of carbon-12 is 12.

Question 2

Define Relative Isotopic Mass.

Answer 2

The mass of an atom of an isotope of an element when measured on scale on which the the mass of an atom of carbon-12 is 12.