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Mole Concept - Coggle Diagram
Mole Concept
Formulae - No. of moles
*Comparing the mole ratio - Finding the limiting and excess reagents / Finding no. of moles
2) Mass / Ar or Mr
1) No. of particles / Avogadro's constant
1 mole = 6 × 10^23 particles
4) Molarity (mol/dm^3) × Volume of solution (dm^3)
3) Volume of gas / 24dm^3 (Gas)
Units
1) Mass = grams
2) Mole = Mol
3) Volume = dm^3
4) Mass concentration = g/dm^3
5) Mole concentration = mol/dm^3
Other formulae
Deriving the empirical formula
1) Divide each mass by Ar or percentage to obtain no. of moles -> 2) Divide each no. of moles by the smallest number from step 1-> 3) Obtain the empirical formula
Deriving the molecular formula
n(empirical formula) = molecular formula
n = Mr of the compound / Mr of the empirical formula of the same compound
Empirical Formula - Simplest whole number ratio
Molecular Formula - Exact no. of atoms in a molecule
Percentage
Yield
(Actual yield / Theoretical yield) × 100%
Purity
(Actual amount of pure substance / Theoretical amount of substance) × 100%
*Theoretical amount of substance = Mass of impure sample (Given)
Percentage of an element in a compound
Concentration formulae(g/dm^3 and mol/dm^3)
1) Mass of solute / Volume of solution (dm^3)
2) Concentration (mol/dm^3) × Mr of solute
1) No. of moles of solute / Volume of solution (dm^3)
Mass formulae
Mass of one mole of element or compound: Ar or Mr
Mass of an element in a compound
(No. of atoms of the element in the formula × Ar of the element / Mr of the compound) × Mass of sample
1) No. of moles × Ar or Mr
Gases
*Avogadro's law: Equal volumes of all gases at the same temperature and pressure contain the same no. of particles
Volume of 1 mole of any gas = 24dm^3 (molar volume)
1) No. of moles × Molar volume