Relative Formula Mass Flashcards
1
Q
What is the symbol for Relative Atomic Mass?
A
Aᵣ
2
Q
What is the relative atomic mass of Carbon-12?
A
exactly 12
3
Q
What is the relative atomic mass?
A
How heavy atoms are compared with a Carbon-12 atom
4
Q
What is relative atomic mass usually equal to?
A
The mass number (bigger one)
5
Q
What is the symbol for Relative Formula Mass?
A
Mᵣ
6
Q
How do you work out Relative Formula Mass?
A
Add up all the relative atomic masses of each element in the formula
7
Q
What is the relative formula mass of MgCl₂?
Mass number:
Mg = 24
Cl = 35.5
A
= 24 + (35.5*2)
= 24 + 71
= 95
8
Q
One Mole of a substance is equal to…
A
It’s Mᵣ in grams
9
Q
The relative formula mass of a substance in grams =
A
One mole of that substance
10
Q
Number of Moles =
A
Mass in g (of element/compound) / Mᵣ (of element/compound)
