Counting Atoms How many atoms are in: NaCl? H2O? MgSO4? Pb(SO4)2?

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Calculating Molar Mass

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Presentation transcript:

Counting Atoms How many atoms are in: NaCl? H2O? MgSO4? Pb(SO4)2? We can’t actually count atoms in chemistry! b/c they are too small!! So what can we count??

Molar Mass of Compounds Molar Mass = the sum of the masses of each element if we had 1 mole Ex: CO2 Carbon has a MM of 12.01g/mole Oxygen has a MM of 16.00g/mole Molar mass of CO2 is C =1 x 12.01= 12.01 + O =2 x 16.00= 32.00 44.01g/mole

Molar Mass Find the Molar Masses of the following compounds. Water Sodium chloride (Salt) Sodium bicarbonate (Baking Soda) Glucose

Water Sodium chloride (Salt)

Sodium bicarbonate (Baking Soda) 4. Glucose

Representative Particles Type of Substance Description R.P. ( UNIT) Element 1 symbol ATOM Covalent Compound 2 or more Non-metals MOLECULE Ionic Compound Metal (or NH4) and a non-metal FORMULA UNIT

Caribbean Monkeys Eat Avocados In Forest Caribbean = Covalent Monkeys = Molecules

Caribbean Monkeys Eat Avocados In Forest Eat = Element Avocados = Atoms

Caribbean Monkeys Eat Avocados In Forest In = Ionic Forest = Formula Unit

Determine the type of Representative Particle 1. Mg 2. C3H8 3.NaCl 4. CBr4 5. Li 6. K2O 7. Cl2 8. H2O

Welcome to St. Mole Islands!!! http://www.youtube.com/watch?v=i5Cg3J8q9i8

To go anywhere on the mole islands you must go thru the mole!!! 1 mole = 6.02 x 1023 atom or 1 mole = 6.02 x 1023 molecule 1 mole = 6.02 x 1023 formula unit

Using Representative Particles Example Problems Using Representative Particles

How many moles of magnesium is 1.25 x 1023 atoms? Given: Conversions: Work: Want? Answer:

How many moles of magnesium is 1.25 x 1023 atoms? Given Info: Conversions: Work: Want? Answer:

How many molecules are in 2.12 mole of propane-C3H8 ? Given Info: Conversions: Work: Looking for? Answer:

How many molecules are in 2.12 mole of propane-C3H8 ? Given Info: 2.12 mole C3H8 Conversions: 1 mole = 6.02x1023 molecule Work: 2.12 mole 6.02 x 1023 molecule C3H8 C3H8 1 mole C3H8 Want? molecules C3H8 Answer: 1.28 x 1024 molecule C3H8

Example Problems Using Molar Mass

How many grams are in 2 moles of calcium hydroxide? Given Info: Conversions: Work: Want? Answer:

How many molecules are in 4.42 x 106g of water molecules? Given Info: Conversions: Work: Want? Answer

How many molecules are in 4.42 x 106g of water molecules? Given Info: 4.42 x 106g Conversions: MM = 18.02g H2O 1 mole 1mole = 6.02x1023 molecule Work: 4.42x106g 1 mole 6.02x1023 molecules H2O H2O H2O 18.02 g 1 mole H2O H2O Looking for? molecules Answer: 1.48 x 1029 molecules

Example Problems Using Molar Volume

Molar Volume @ STP only Standard Temperature and Pressure: STP Standard Temperature: 273K Standard Pressure: 1 atmosphere (atm) At these 2 conditions: Molar Volume 1 mole = 22.4L

How many liters are 2.78 x 1031 molecules? Given Info: Conversions: Work: Want? Answer: How many liters are 2.78 x 1031 molecules?

How many liters are 2.78 x 1031 molecules? Given Info: 2.78 x 1031 molecules Conversions: 1 mole =6.02x1023 molecules Work: 2.78 x1031 molecules 1 mole 22.4L 6.02 x 1023 1 mole molecules Want? liters Answer: 1.03 x 109 L How many liters are 2.78 x 1031 molecules?

The density of a gaseous compound containing carbon and oxygen is 1 The density of a gaseous compound containing carbon and oxygen is 1.964 g/L @ STP. Determine the molar mass of the compound. Given Info: Conversions: Work: Want? Answer:

The density of a gaseous compound containing carbon and oxygen is 1 The density of a gaseous compound containing carbon and oxygen is 1.964 g/L @ STP. Determine the molar mass of the compound. Given Info: Conversions: Work: Want? Answer: