 # AVAGADRO’S NUMBER. The Mole Dozen: A convenient counting measurement. 1 dozen represents 12 individual objects. eg. 1 dozen particles = 12 particles.

## Presentation on theme: "AVAGADRO’S NUMBER. The Mole Dozen: A convenient counting measurement. 1 dozen represents 12 individual objects. eg. 1 dozen particles = 12 particles."— Presentation transcript:

The Mole Dozen: A convenient counting measurement. 1 dozen represents 12 individual objects. eg. 1 dozen particles = 12 particles 2 dozen particles = 2.5 dozen particles =

The Mole Dozen: A convenient counting measurement. 1 dozen represents 12 individual objects. eg. 1 dozen particles = 12 particles 2 dozen particles = 24 particles 2.5 dozen particles =

The Mole Dozen: A convenient counting measurement. 1 dozen represents 12 individual objects. eg. 1 dozen particles = 12 particles 2 dozen particles = 24 particles 2.5 dozen particles = 30 particles

The Mole Mole: A convenient counting measure used by chemists. 1 mole represents 6.02 x 10 23. eg. 1 mole = 2 moles = 2.5 moles =

The Mole Mole: A convenient counting measure used by chemists. 1 mole represents 6.02 x 10 23. eg. 1 mole = 1 X 6.02 x 10 23 particles 2 moles = 2.5 moles =

The Mole Mole: A convenient counting measure used by chemists. 1 mole represents 6.02 x 10 23. eg. 1 mole = 6.02 x 10 23 particles 2 moles = 2 X 6.02 x 10 23 particles = 12.04 x 10 23 particles 2.5 moles = 2.5 X 6.02 x 10 23 particles = 15.06 x 10 23 particles

Types of Particles Types of Particles: Atoms, compounds or molecules Molecules: 1mol H 2 O = 6.02 x 10 23 H 2 O molecules Atoms: 1mol Na = 6.02 x 10 23 Na atoms Compounds: 1mol NaCl = 6.02 x 10 23 NaCl molecules

Finding the number of Particles using Moles 12.04 X 10 23 / 6.02 X 10 23 = 2

Avagadro’s Number Why 6.02 x 10 23 : It is an observable number. Its convenient to work with. Translation balanced equations: N2N2 3H 2 2NH 3 1 molecule3 molecules2 molecules 1 dozen molecules 3 dozen molecules 2 dozen molecules

Avagadro’s Number Why 6.02 x 10 23 : It is an observable number. Its convenient to work with. Translation balanced equations: N2N2 3H 2 2NH 3 1 molecule3 molecules2 molecules 1 dozen molecules 3 dozen molecules 2 dozen molecules 1mol nitrogen3mol hydrogen2mol ammonia

Avagadro’s Number Why 6.02 x 10 23 : It is an observable number. Its convenient to work with. Translation balanced equations: N2N2 3H 2 2NH 3 1 molecule3 molecules2 molecules 1 dozen molecules 3 dozen molecules 2 dozen molecules 1mol nitrogen3mol hydrogen2mol ammonia 6.02 x 10 23 molecules 18.06 x 10 23 molecules 12.04 x 10 23 molecules

Molar Ratio Molar ration: the ratio of molecules in a reaction. For the reactant side only. 2Na + Cl 2  2NaCl Molar ratio: 2:1 Sentence explaining the reaction:

Molar Ratio Molar ration: the ratio of molecules in a reaction. For the reactant side only. 2Na + Cl 2  2NaCl Molar ratio: 2:1 Sentence explaining the reaction: Two moles of sodium reacts with one mole of chlorine gas to form two moles of Sodium chloride.

Balancing Equations Remember: Conservation of Mass: The amount of mass of your starting chemicals (reactants) equals the mass of the mass of the final chemicals (products). The number of moles you start with = the number of moles of you end with

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