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STOICHIOMETRY QUICK GUIDE
© Stellar Academy – For Personal Use Only
, Page 1
The Mole Concept
1 mole = 6.022 × 10²³ particles
Particles = atoms, molecules, or formula units
Example:1 mol of H₂O = 6.022 × 10²³ molecules
of H₂O
2. Converting Mass(g)↔ Moles
Formula: moles = mass (g) ÷ molar mass(g/mol)
Example:
Find moles in 36 g of H₂O
Molar mass of H₂O = 18 g/mol
moles = 36 ÷ 18 moles = 2 mol
3. Converting Moles ↔ Molecules
Formula: particles = moles × 6.022 × 10²³
Example:
How many molecules in 0.5 mol CO₂? particles
= 0.5 × 6.022 × 10²³ particles = 3.01 × 10²³ molecules
4. Finding Moles Using a Chemical Equation
Steps: Balance the equation
Equation Use mole ratio from coefficients
STOICHIOMETRY QUICK GUIDE
© Stellar Academy – For Personal Use Only
, Page 1
The Mole Concept
1 mole = 6.022 × 10²³ particles
Particles = atoms, molecules, or formula units
Example:1 mol of H₂O = 6.022 × 10²³ molecules
of H₂O
2. Converting Mass(g)↔ Moles
Formula: moles = mass (g) ÷ molar mass(g/mol)
Example:
Find moles in 36 g of H₂O
Molar mass of H₂O = 18 g/mol
moles = 36 ÷ 18 moles = 2 mol
3. Converting Moles ↔ Molecules
Formula: particles = moles × 6.022 × 10²³
Example:
How many molecules in 0.5 mol CO₂? particles
= 0.5 × 6.022 × 10²³ particles = 3.01 × 10²³ molecules
4. Finding Moles Using a Chemical Equation
Steps: Balance the equation
Equation Use mole ratio from coefficients
