Relative Atomic Mass Flashcards
1
Q
What is Ar?
A
Relative atomic mass
2
Q
What does Ar use?
A
Elements only
3
Q
Define relative atomic mass
A
The average mass of an element relative to one twelth of the mass of an atom of carbon-12
4
Q
What is carbon-12 used in Ar?
A
It is highly abundant and the twelve has very little rounding therefore it is highly accurate
5
Q
What are isotopes?
A
Atoms with the same number of protons but a different number of neutrons
6
Q
How is Ar calculated?
A
The sum of (the individual mass of each isotope multiplied by their percentage abundance) divided by the sum of the percentage abundances
7
Q
What are the units for Ar?
A
grams per mol
