Relative masses and moles Flashcards
1
Q
What is relative atomic mass?
A
An average mass of isotopes making up an element and how much of each element there is. (the little number under the element on the periodic table)
2
Q
What is the symbol for relative atomic mass?
A
Aᵣ
3
Q
What is relative formula mass?
A
The relative atomic masses of all the atoms in the molecular formula added together
4
Q
What is the symbol for relative formula mass?
A
Mᵣ
5
Q
Why are relative masses used?
A
The actual mas is too small to find by weighing
6
Q
What is a mole?
A
the relative formula mass of a substance in grams (6.02x10²³particles)
7
Q
How much is a mole of carbon atoms?
A
12g because the Aᵣ of carbon is 12
8
Q
What is the Avogadro constant?
A
6.02x10²³
9
Q
What is the equation for number of moles?
A
Moles = mass/Mr or mass/Ar
