Chapter 1

Question 1

Relative atomic mass

Answer 1

Weighted average mass of naturally occurring atoms of an element on a scale where an atom of carbon-12 has a mass of exactly 12 units

Question 2

Mole

Answer 2

Is the amount of that substance that has the same number of specific particles there are atoms in exactly 12g of the carbon-12 isotope

Question 3

How to determine Ar from mass spectra

Answer 3

Multiple each isotopic mass by its percentage abundance
Add the figures
Divide by 100