Definitions

Question 1

What is a mole?

Answer 1

A measurement of particles. The same number of particles there are in 12.000g of C12

Question 2

Relative atomic mass
(Ar)

Answer 2

The weighted average mass of an atom of an element relative to 1/12 the mass of an atom of C12

Question 3

Relative molecular mass
(Mr)

Answer 3

The average mass of a molecules on a scale where at atom of C12 is exactly 12

Question 4

define isotope

Answer 4

atoms of the same element that have the same number of protons and electrons, but a varied number of neutrons