Moles, Moles and More Moles

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Presentation transcript:

Moles, Moles and More Moles

What is gram atomic mass? 1 mole of an element = molar mass of that element The unit for molar mass is Gram!

What is the mass of 1 mol of each of these elements? 1 mol C = 12.0 g 87.6 g 1 mol Sr = 63.5 g 1 mol Cu =

1 mole of a compound = molar mass of that compound What is gram mass? 1 mole of a compound = molar mass of that compound Example 1: Find the molar mass of K2CO3 K: C: O: 2 x 39.1 = 78.2 1 x 12.0 = 12.0 3 x 16.0 = 48.0 138.2 g 1 mole K2CO3 = 138.2 g K2CO3

The subscripts tell you the number of moles of atoms! Example 2: Find molar mass of Ca3(PO3)2 Ca: P: O: 3 x 40.1 = 120.3 2 x 31.0 = 62.0 6 x 16.0 = 96.0 278.3 g 1 mole Ca3(PO3)2 = 278.3 g Ca3(PO3)2

1 mol = molar mass in grams of the element, molecule or ionic compound We can using dimensional analysis to solve mole problems! Ex: How many moles are in 4.2 x 1024 grams C2H6? 4.2 x 1024 g C2H6 1 mol C2H6 = 1.4 x 1023 mol C2H6 30.0 g C2H6 C: H: 2 x 12.0 = 24.0 6 x 1.0 = 6.0 30.0 g

The Star Nose Mole Map Mole Volume of Solution Molarity (moles/liter) Volume of Gas (at STP) Mass Molar Mass (grams) 22.4 (liters) Mole Balanced Equation (thermochemical) 6.02 x 1023 atoms of element, molecules, formula units count subscripts Energy of a Reaction Representative Particles Atoms of element formula units molecules Number of Atoms in 1 Compound Unit

count subscripts # of atoms Volume of Gas (at STP) Representative Particles atoms of element formula units molecules _ 22.4 L 6.02 x 1023 Atoms of element, or Molecules, or Formula units Mole Mass molar mass g Number of Atoms in 1 Compound Unit The Mole Map Conversions count subscripts # of atoms

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 atoms of element formula units molecules ___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