7.2 More Mole Conversions!!!. - Molecular Oxygen = O 2 - Atomic Oxygen = O from the periodic table 7 elements that exist as diatomic molecules (MEMORIZE)

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Presentation transcript:

7.2 More Mole Conversions!!!

- Molecular Oxygen = O 2 - Atomic Oxygen = O from the periodic table 7 elements that exist as diatomic molecules (MEMORIZE) H 2 F 2 O 2 N 2 Cl Br 2 I 2

Molar Mass The mass in grams of 1 mol of a substance. Molar Mass is found using the periodic table!!! What is the molar mass of nitrogen gas? (N 2 ) 2 (14g) = 28 g

1 mol of a substance = molar mass of a substance Example: What is the molar mass of nitrogen gas, N 2 ? 1 mol N 2 28 g N 2

Another Example What is the molar mass of molecular oxygen, O 2 ? 2 (16g) = 32 g

Knowing molar mass is important because it allows us to make the following conversions: mass mol representative particle

Ex. 1 Example problem How many grams are in 2 mol of nitrogen gas? Given: 2 mol N 2 Known: 1 mol N 2 = 28g N 2 Mol  mass 2 mol N 2 28 g N 2 = 56 g N 2 1 mol N 2

EX.2 How many molecules are in 84 g of nitrogen gas? Given: 84 g N 2 Known: 1 mol N 2 = 28 g N 2 1 mol N 2 = 6.02 x molecules N 2 Mass  mol  molecules

How many molecules are in 84 g of nitrogen gas? Given: 84 g N 2 Known: 1 mol N 2 = 28 g N 2 1 mol N 2 = 6.02 x molecules N 2 Mass  mol  molecules 84 g N 2 1 mol N x molecules N 2 28 g N 2 1 mol N 2 = x molecules

Your Turn Ex.3: Find the number of moles in 176 g of CO 2. Given: Known: Road Map:

Your Turn Ex.3: Find the number of moles in 176 g of CO 2. Given: 176 g CO 2 Known: 44 g CO 2 = 1 mol CO 2 Road Map: Mass  Mol

Your Turn Ex.3: Find the number of moles in 176 g of CO 2. Given: 176 g CO 2 Known: 44 g CO 2 = 1 mol CO 2 Road Map: Mass  Mol 176 g CO 2 1 mol CO 2 = 4 mol CO 2 44 g CO 2

Ex. 4 Find the mass of 1.2 x molecules of NaCl Given: 1.2 x molecules NaCl Known: Road Map:

Ex. 4 Find the mass of 1.2 x molecules of NaCl Given: 1.2 x molecules NaCl Known: 1 mol = 6.02x10 23 molecules NaCl 1 mol NaCl = 58 g NaCl Road Map: Molecules  mol  mass

Ex. 4 Find the mass of 1.2 x molecules of NaCl Given: 1.2 x molecules NaCl Known: 1 mol = 6.02x10 23 molecules NaCl 1 mol NaCl = 58 g NaCl Road Map: Molecules  mol  mass 1.2 x molecules NaCl 1 mol NaCl 58 g NaCl 6.02x10 23 molecules 1 mol NaCl NaCl

Volume of a mol of a gas at STP STP: (standard temperature and pressure)  0°C or 273 K  1 atm or kPa 1 mol of a gas occupies 22.4 L 1 mol or22.4 L 22.4L 1 mol

Ex. 5 Determine the volume in L of 2 mol of oxygen gas at STP. Given: 2 mol O 2 Known: 1 mol O 2 = 22.4 L Work:

Ex. 5 Determine the volume in L of 2 mol of oxygen gas at STP. Given: 2 mol O 2 Known: 1 mol O 2 = 22.4 L Work: 2 mol O L= 44.8 L O 2 1 mol O 2

Your turn! Ex. 6 Determine the number of moles in 67.2 L of oxygen gas. Given: 67.2 L O 2 Known:

Your turn! Ex. 6 Determine the number of moles in 67.2 L of oxygen gas. Given: 67.2 L O 2 Known: 1 mol O 2 = 22.4 L Work 67.2 L O 2 1 mol O 2 = 3 mol O L

Now we have a big road map…. Volume (L) # representative Mass moles particles

Ex. What is the volume of 8 g of O 2 ? Given: 8 g of O 2 Known:

Ex. What is the volume of 8 g of O 2 ? Given: 8 g of O 2 Known: 1 mol O 2 = 32 g O 2 1 mol O 2 = 22.4 L Road Map: Mass  Mol  volume 8 g of O 2 1 mol O L = 5.6 L 32 g O 2 1 mol O 2

How much volume does 1.8 x molecules of Cl 2 at STP occupy? Road Map Molecules  mol  volume

How much volume does 1.8 x molecules of Cl 2 at STP occupy? Road Map Molecules  mol  volume 1.8 x molecules of Cl 2 1 mol Cl L 6.02 x Cl 2 1 mol Cl 2 = 67.2 L

Density = mass/volume Units: grams / L When given density, you can calculate molar mass using the volume of 1 mol. g 22.4 L g L 1 mol mol

The End!!!