Mole Concept – Quick Formula Sheet
1. Basic Formulas
Concept
Formula
Notes
Mole (n)
n = Given mass/ Molar mass
Mass in grams
Number of Particles
Particles= n × 6.022×1023
Avogadro’s number
Moles from particles
n = 6.022×1023/Number of
particles
Applies to
atoms/ions/molecules
Molar Volume (Gas at STP)
1 mole = 22.4 L
Use only at STP
2. Volume & Gas Calculations
Formula
Use
n= Volume of gas /22.4L
For gases at STP
Volume of gas= n × 22.4
If moles known
3. Empirical Formula Steps (Quick)
Write short steps:
1. Write % composition as grams.
2. Convert to moles (divide by atomic mass).
3. Divide by smallest value.
4. Round to whole numbers → Empirical Formula.
