The Heart of Chemistry.

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Presentation transcript:

The Heart of Chemistry

At STP, 1 mol of any gas occupies 22.4 L What is STP? Standard Temperature and Pressure

What is standard temperature & pressure? Standard temperature is 0o C Standard pressure is 101.3 kPa or 1 atm

Why is the volume of a gas measured at STP? The volume of gas varies with a change in temperature and pressure At the same temperature & pressure: 1 mole of any gas has the same volume.

1 mol = 6.02 x 1023 atoms, molecules or ions 1 mol = 22.4 L 1 mol = 6.02 x 1023 atoms, molecules or ions 1 mol = molar mass in g

The Mole Mall Conversions Volume of Gas (at STP) _1 mol_ 22.4 L _22.4 L_ 1 mol _Molar mass_ 1 mol ______1 mol______ 6.02 x 1023 particles Mass Mole Representative Particles molecules formula units atoms ___1 mol___ Molar mass _6.02 x 1023 particles 1 mol _____# of atoms____ 1 molec (or form unit) _1 molec (or form unit)_ # of atoms The Mole Mall Conversions Number of Atoms in formula

The Mole Mall Conversions Volume of Gas (at STP) _1 mol_ 22.4 L _22.4 L_ 1 mol ______1 mol______ 6.02 x 1023 particles Representative Particles (molecules / formula units / atoms) _Molar mass_ 1 mol Mole Mass ___1 mol___ Molar mass _6.02 x 1023_ particles 1 mol _____# of atoms____ 1 molec (or form unit) _1 molec (or form unit)_ # of atoms Number of Atoms in formula The Mole Mall Conversions

The Mole Mall: Let’s go shopping! Volume 1 mol B = 22.4 L B The Mole Mall: Let’s go shopping! Get x & y from the coefficients in the balanced equation Volume 1 mol A = 22.4 L A Mol B 1 mol A x mol B = __ mol B y mol A Molecules 1 mol B = 6.02 x 1023 molecules B Mol A Mass 1 mol B = (molar mass) g B Molecules 1 mol A = 6.02 x 1023 molecules A Mass 1 mol A = (molar mass) g A

Molecules, Form. Units, Atoms The Heart of Chemistry Atoms in Formula ÷ no. of atoms in formula ÷ 22.4 L X no. of atoms in formula Volume X 22.4 L Molecules, Form. Units, Atoms ÷ 6.02 x 1023 X 6.02 x 1023 Mole ÷ molar mass (g) X molar mass (g) Mass (g)

÷ 22.4 L ÷ 6.02 x 1023 ÷ molar mass (g) The Heart of Chemistry Molecules, Form. Units, Atoms Volume ÷ 22.4 L ÷ 6.02 x 1023 X 22.4 L x 6.02 x 1023 Mole ÷ molar mass (g) X molar mass (g) Mass (g)