1. Determine the Gram Formula Mass of a compound 2. Convert between Grams and Moles 3. Convert between Moles and Grams.

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Presentation transcript:

1. Determine the Gram Formula Mass of a compound 2. Convert between Grams and Moles 3. Convert between Moles and Grams

Every element has a different atomic mass

12.011g = 1 mole g/mole

Molar Mass = g/mol 1 mole of Lead = g

Atomic Mass has a unit of grams/mole Mass of Magnesium = g/mol 1 mole of Magnesium is grams

Mass of Mg g/mol Solve the following problem: How many moles are present in 55 g of Magnesium?

Convert 55g of Mg to Moles 55 g Mg g Mg 1 mol Mg = 2.26 moles Mg If 1 mole is 24 g, I predict 55 g is more than 1 mole

1. Cu(NO 3 ) 2 #1 How many of each atom are present #2 What are the masses of each atom? #3 Multiply the # of atoms by the mass #4 Add up the amounts and this is the Gram Formula Mass Cu = 1 N = 2 O = g/mol g/mol g/mol X X X g/mol 1 mole of Cu(NO 3 ) 2 is g

2. KMnO 4 #1 How many of each atom are present K = 1 Mn = 1 O = 4 #2 What are the masses of each atom? g/mol g/mol g/mol #3 Multiply the # of atoms by the mass X X X #4 Add up the amounts and this is the Gram Formula Mass g/mol 1 mole of KMnO 4 is g

Do the rest as Homework! Now, take out “Moles and Mass”

Convert 25g of NaCl to Moles #1 Name the Compound 1. NaCl = Sodium Chloride #2 Find the GFM Na = 1 x g/mol Cl = 1 x g/mol g/mol #3 Convert grams to moles (Use dimensional analysis) 25 g NaCl g NaCl 1 mol NaCl Conversion Factor! = 0.43 moles NaCl If 1 mole is 58 g, I predict 25 g is less than 1 mole

Convert 405 g of Ag 2 SO 4 to Moles #1 Name the Compound 2.Ag 2 SO 4 = Silver (I) Sulfate #2 Find the GFM Ag = 2 x g/mol S = 1 x g/mol O = 4 x g/mol g/mol #3 Convert grams to moles (Use dimensional analysis) 405 g Ag 2 SO g Ag 2 SO 4 1 mol Ag 2 SO 4 Conversion Factor! = 1.30 moles Ag 2 SO 4 If 1 mole is 311 g, I predict 405g is more than 1 mole

Do Not Forget Units Predictions Help

Section 2 (on back): Converting from Moles to Grams Simply flip the conversion factor around!

Convert moles of NaCl to grams #1 Name the Compound 1. NaCl = Sodium Chloride #2 Find the GFM Na = 1 x g/mol Cl = 1 x g/mol g/mol #3 Convert moles to grams(Use dimensional analysis) mol NaCl g NaCl 1 mol NaCl Conversion Factor! = 14.6 grams NaCl If 1 mole is 58 g, and I have moles, the answer should be less than 58 g of NaCl Notice moles on bottom!

Convert 1.70 moles of SiO 2 to grams #1 Name the Compound 2. SiO 2 = Silicon Dioxide #2 Find the GFM Si = 1 x g/mol O = 2 x g/mol g/mol #3 Convert moles to grams(Use dimensional analysis) 1.70 mol SiO g SiO 2 1 mol SiO 2 Conversion Factor! = g SiO 2 If 1 mole is 60 g, and I have 1.70 moles, the answer should be more than60 g of SiO 2 Notice moles on bottom!

1. Determine the GFM of a compound 2. Convert between Grams and Moles Try the rest as Homework 3. Convert between Moles and Grams

Gram Formula Mass # 3,4,5,6,7

3. Fe 2 SO 4 #1 How many of each atom are present Fe = 2 S = 1 O = 4 #2 What are the masses of each atom? g/mol g/mol g/mol #3 Multiply the # of atoms by the mass X X X #4 Add up the amounts and this is the Gram Formula Mass g/mol 1 mole of Fe 2 SO 4 is g

C 6 H 12 O 6 C = 6 x g/mol H = 12 x g/mol O = 6 x g/mol g/mol This bag is 1 mole or 6.02 x molecules of Sucrose

Mass to Moles Side #1 = 3,4,5

Convert g of P 2 O 5 to Moles #1 Name the Compound 3. P 2 O 5 = Phosphorus Pentoxide #2 Find the GFM P= 2 x g/mol O = 5 x g/mol g/mol #3 Convert grams to moles (Use dimensional analysis) g P 2 O g P 2 O 5 1 mol P 2 O 5 Conversion Factor! =.70 moles P 2 O 5 If 1 mole is 142 g, I predict 100.5g is less than 1 mole

Convert g of (NH 4 ) 2 CrO 4 to Moles #1 Name the Compound 4. ( NH 4 ) 2 CrO 4 = Ammonium Chromate #2 Find the GFM N = 2 x g/mol H = 8 x g/mol S = 1 x g/mol O = 4 x g/mol g/mol #3 Convert grams to moles (Use dimensional analysis) g (NH 4 ) 2 CrO g (NH 4 ) 2 CrO 4 1 mol (NH 4 ) 2 CrO 4 Conversion Factor! = 4.07 moles (NH 4 ) 2 CrO 4 If 1 mole is 132 g, I predict 538.2g is more than 1 mole

Convert 75 g of TiO 4 to Moles #1 Name the Compound 5. TiPO 4 = Titanium Phosphate #2 Find the GFM Ti= 1 x g/mol O = 4 x g/mol g/mol #3 Convert grams to moles (Use dimensional analysis) 75 g TiO g TiO 4 1 mol TiO 4 Conversion Factor! =.67 moles TiO 4 If 1 mole is 112 g, I predict 75g is less than 1 mole

Moles to Grams Side #2 = 3,4,5

Convert.0078 moles of CrPO 4 to grams #1 Name the Compound 3. CrPO 4 = Chromium Phosphate #2 Find the GFM Cr = 1 x g/mol P = 1 x g/mol O = 4 x g/mol g/mol #3 Convert moles to grams(Use dimensional analysis).0078 mol CrPO g CrPO 4 1 mol CrPO 4 Conversion Factor! = g SiO 2 If 1 mole is 145 g, and I have.0078 moles, the answer should be less than 145 g of CrPO 4 Notice moles on bottom!

Convert.31 moles of N 2 O to grams #1 Name the Compound 4. N 2 O = Dinitrogen Monoxide #2 Find the GFM N = 2 x g/mol O = 1 x g/mol g/mol #3 Convert moles to grams(Use dimensional analysis).31 mol N 2 O g N 2 O 1 mol SiO 2 Conversion Factor! = g SiO 2 If 1 mole is 44 g, and I have.31 moles, the answer should be less than 44 g of N 2 O Notice moles on bottom!

Convert 83.1 moles of I 2 to grams #1 Name the Compound 5. I 2 = Iodine Gas #2 Find the GFM I = 2 x g/mol #3 Convert moles to grams(Use dimensional analysis) 83.1 mol I g I 2 1 mol I 2 Conversion Factor! = g SiO 2 If 1 mole is 254 g, and I have 83.1 moles, the answer should be more than 254 g of I 2 Notice moles on bottom!