4.4 Moles I Flashcards
1
Q
Define relative formula mass?
A
RFM is the mass of a formula unit of a substance
2
Q
What is percentage by mass?
A
Shows the mass of a substance that comes from a particular element
3
Q
How to find percentage by mass?
A
mass of x / RFM X 100
4
Q
What is the equation for moles?
A
moles = mass/ RFM
5
Q
How does molecular formula differ from empirical?
A
Molecular formula is uncancelled. For examples:
MF = H2O2, EF = HO
6
Q
How to find percentage yield?
A
experimental / theoretical X 100
7
Q
What does ‘experimental’ mean in a percentage yield equation?
A
From the experiment
8
Q
What does ‘theoretical’ mean in a percentage yield equation?
A
From the calculation
