What doesn’t belong? Dozen Couple Few Baker’s Dozen Ten

The Mole

Definition Avogadro’s Number Mole- unit standing for 6.02 x 1023 particles 602,000,000,000,000,000,000,000 particles Avogadro’s Number

Why such a BIG unit? Atoms and Molecules are TINY! A drop of water contains 10 trillion water molecules!

Moles and Particles 6.02 x 1023 makes a chemist’s life a lot easier It’s impossible to keep track of one atom so scientist discovered this number that gives us the molar mass of an atom Molar mass is the mass of 6.02 x 1023 particles of a given substance Mass is given in grams

Molar Mass Luckily 6.02 x 1023 particles, or a mole, adds up to the same number as the avg. atomic mass-but in grams So a mole of magnesium has a mass of 24.305 grams!

We don’t always have exactly 1 mole, though. When we have different amounts of moles, we can convert between atoms and moles

Mole Calculations Moles Particles Multiply by Avogadro’s Number Divide by Avogadro’s Number

Example 1 A lab experiment calls for 2.00 moles of Calcium. How many particles of Calcium are required? How can we solve this? ID what we’re given and what the question’s asking for and set up the T-Chart 6.02 x 1023 particles 2 moles Calcium 1 mole Calcium

Example 2 You have 12.04x1023 atoms of sulfur. How many moles of sulfur do you have?

Whiteboards How many moles are 1.20 x 1025 atoms of phosphorous?

Whiteboards How many moles of magnesium is 3.01 x 1022 atoms of magnesium?

Whiteboards How many atoms are in 0.750 moles of zinc?

Converting from grams  mole Mole  grams Calculating molecular mass

Molar mass: mass of 1 mole of in grams 1 mole C atoms = _____________________ 1 mole of C atoms has a mass of_________ g. Molar mass of O = ___________ Molar mass of Li = ____________ For any element, the __________________________________ 3.2

What is the mass of one mole of: C Hg Cu Fe 3.2

Molecular mass (or molar mass) is the sum of the molar masses of all the atoms in a molecule. SO2 S 32.06 g/mol O 16.00 g/mol SO2 64.06 g/mol SO2 consists of ________ and ______________. 1 mole SO2 = _________________ ________________molecules of SO2 has a total mass of ______________ 3.3

Calculate the molar mass of the following NO2 C6H12O6 (NH4)3PO4

When I bought my fly kicks… If I had 20 Wolfies, and the cost of one pair of kicks is 4 Wolfies for 1 pair, how many pairs could I have? What’s my conversion factor? What unit am I given? What unit is the question asking for? 20 Wolfie 1 pair (20/4) pairs 5 pairs 4 Wolfies Now...

If I had 20 grams of helium, and one mole of helium is 4 grams, how many moles of helium could I have? What’s my conversion factor? What unit am I given? What unit is the question asking for? 20 grams He 1 mole He (20/4) moles He 5 moles He 4 grams He

Grams  Mole Conversion 1 mole of Zinc has a mass of 65.39 g. Conversion factor: 1 mole Zn 65.39 g Zn OR 65.39 g Zn How many moles of Zn are in 85 grams?

How many moles are found in the following quantities? 10.0 g Fe 8.0 g O 1.15 g Mg 15.63 g Cl Hint: What are the conversion factors? Partner work

Mole  Gram Conversion 1 mole of Zinc has a mass of 65.39 g. Conversion factor: 1 mole Zn 65.39 g Zn OR 65.39 g Zn If I had 2 moles of Zn, how many grams of Zn do I have? 2 moles Zn 65.39 g Zn 1 mole Zn 130.78 g Zn

Find the mass in grams of the following quantities: 1.35 mol Fe 24.5 mol O 0.876 mol Ca 1.25 mol H Hint: What are the conversion factors?

How many grams are found in 2.3 moles of C3H8? How many molecules? 2.3 moles C3H8 44 g C3H8 2.3 x 44 g C3H8 101.2 g C3H8 1 mole C3H8 2.3 moles C3H8 6.02 x 1023 molecules C3H8 1 mole C3H8 2.3 x (6.02 x 1023 molecules C3H8) 13.2 x 1023 molecules C3H8