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Chemistry Week 24. Please get out your Classwork and calculator!. Feb 27th , 2013. AGENDA: 1 – Agenda Bell Ringer 2 – Notes: Mole Conversion: 2 step conversions 3 – Work Time. Today’s Goal: Students will be able to convert between moles, grams and particles. Homework
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Chemistry Week 24 Please get out your Classwork and calculator!
Feb 27th, 2013 AGENDA: 1 – Agenda Bell Ringer 2– Notes: Mole Conversion: 2 step conversions 3– Work Time Today’s Goal: Students will be able to convert between moles, grams and particles. Homework • Mole Conversions Wkst2 – due tomorrow! (change to classwork assignment) • Work from Week 23 due by Friday
Wednesday, February 27 Objective: Students will be able to convert between moles, grams and particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4?
Wednesday, February 27 Objective: Students will be able to convert between moles, grams and particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4?
Wednesday, February 27 Objective: Students will be able to convert between moles, grams and particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4?
Wednesday, February 27 Objective: Students will be able to convert between moles, grams and particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4?
Feb 27th, 2013 AGENDA: 1 – Agenda Bell Ringer 2– Notes: Mole Conversion: 2 step conversions 3– Work Time Today’s Goal: Students will be able to convert between moles, grams and particles. Homework • Mole Conversions Wkst2 – due tomorrow! (change to classwork assignment) • Work from Week 23 due by Friday
Wednesday, February 27 Objective: Students will be able to convert from moles to grams and moles to particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4? Molar mass of H2SO4 = 98.1 g/mol. 3.75 moles x 98.1 grams = 1 mole 3.75 x 98.1 g = 367.9 g
Mole Conversions • Topic: Mole Conversions Part 2 • Date: 2/26/2013 • Yesterday mole to gram conversions • Example: If you have an 8.0 mole sample of NaCl, how many grams do you have? 1. NaCl = Na = Cl = 58.44 g 1 mol 2. 8.0 mole NaClx 58.44 g 1 mol = 467.52 g NaCl • = 22.99 1x • 22.99 = 35.45 1x +______ 35.45
Gram to Mole • What if you were given a 200 gsample of NaCl, and you wanted to convert to moles? Molar Mass of NaCl = 200 g mole gram gram mole multiplication division • 58.44 g • 1 mole • 1 mole • 58.44 g • = • x 1 mole= • 58.44 g 200 mole = 58.44 3.42 mol NaCl
Gram to Mole (cont) • Example: • If you have a 150 g sample of AlPO4, how many moles do you have? 1. AlPO4 = Al = P = O = 121 g mol 2. 150 gx 1 mol 121 g = 1.24 mol AlPO4 • = 26 1 x • 26 1 x 31 = 31 • = 64 + 4 x • 16
Mole to Particle Conversion Conversion • YESTERDAY • Imagine if you want to know HOW MANY atoms are in 1.5 moles of silver metal… 1.5 mole • X6.02 x 10231 mole = 9.03 x 1023 atoms
Particle to Mole • What if you were given a 2.00 x 1026 particlessample of NaCl, and you wanted to convert to moles? 2.00x 1026 particles mole particles particles mole multiplication division • x 1 mole= • 6.02 x 1023 part 2.00 x 1026 mole 6.02 x 1023 3.32 x 102 mol NaCl
Problem Solving Decision Tree Read the problem If moles and grams If moles and particles Calculate Molar Mass If particles moles If moles grams If grams moles If moles particles Multiply by molar mass Divide by molar mass Multiply by 6.02 x 1023 Divide by 6.02 x 1023
Mole to Gram Conversion • Imagine if you want to measure out a 1.5 mole sample of silver metal…? • Could you count out 1.5 moles? • But you can use molar mass to convert moles to grams, and you can measure grams. Molar Mass of Silver = 1.5 mole ... NO! • 107.9 g Ag • 1 mole Ag • x107.9 g= • 1 mole 1.5 x 107.9 g = 161.8 g Ag
Practice Problems • If you had a 7.5 mole sample of H2O, how many grams would you have? • Determine the molar mass. • Convert! (Watch units!) 1. H2O = 2xH = O = 18.0 g 1 mol 2. 7.5 mole H2O x 18.0 g 1 mol = 7.5 x 18.0 g H2O = 135.0 g H2O (2 x 1.0) 16.0 +
Gram to Mole • What if you were given a 200 gsample of NaCl, and you wanted to convert to moles? Molar Mass of NaCl = 200 g mole gram gram mole multiplication division • 58.5 g • 1 mole • 1 mole • 58.5 g • = • x 1 mole= • 58.5 g 200 mole = 58.5 3.4 mol NaCl
Particle to Mole • What if you were given a 2.00 x 1026 particlessample of NaCl, and you wanted to convert to moles? 2.00x 1026 particles mole particles particles mole multiplication division • x 1 mole= • 6.02 x 1023 part 2.00 x 1026 mole 6.02 x 1023 = 3.32 x 102 mol NaCl