Molar Conversions

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Molar Conversions
Table of Contents
Lecture/Lab/Activity Date
Pg
41. Molar Conversions 11/15/10
85
Objective The student will define the mole
concept and record how to perform molar
conversions for atoms, ions, and molecules then
use their notes to complete the Molar conversion
activity Agenda Molar Conversions
Lecture Homework
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Journal - Reflection

• Describe the characteristics of ionic and
  covalent compounds and how the octet rule
  influences chemical reactivity. Include some
  notable characteristics that are different
  between each compound. Use each of the words in
  the word bank.
• Word Bank
• Electrons Full Solubility
• Shared Valence Electron Conductivity
• Transferred melting/boiling point Physical
  structure/state
• 15 Minutes to Complete

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A. What is the Mole?

• A counting number (like a dozen)
• Avogadros number (NA)
• 1 mol 6.02 ? 1023 items

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A. What is the Mole?
3 Basic ways to Measure Matter

• Counting representative molecules (Molecules or
  Formula Units)

• Mass (grams)

• Volume (liters for gases)

• Once a method is determined, we can convert
  between units

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B. Molar Mass

• Mass of 1 mole of an element or compound.
• Atomic mass tells the...
• atomic mass units per atom (amu)
• grams per mole (g/mol)
• Round to 2 decimal places

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B. Molar Mass Examples

• carbon
• aluminum
• zinc

12.01 g/mol 26.98 g/mol 65.39 g/mol
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B. Molar Mass Examples

• water
• sodium chloride

• H2O
• 2(1.01) 16.00 18.02 g/mol
• NaCl
• 22.99 35.45 58.44 g/mol

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B. Molar Mass Examples

• sodium bicarbonate
• sucrose

• NaHCO3
• 22.99 1.01 12.01 3(16.00) 84.01
  g/mol
• C12H22O11
• 12(12.01) 22(1.01) 11(16.00) 342.34
  g/mol

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C. Molar Conversions
molar mass
6.02 ? 1023
(g/mol)
(particles/mol)
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C. Molar Conversion Examples

• How many moles of carbon are in 26 g of carbon?

26 g C
1 mol C 12.01 g C
2.2 mol C
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C. Molar Conversion Examples

• How many molecules are in 2.50 moles of
  C12H22O11?

6.02 ? 1023 molecules 1 mol
2.50 mol
1.51 ? 1024 molecules C12H22O11
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C. Molar Conversion Examples

• Find the mass of 2.1 ? 1024 molecules of NaHCO3.

2.1 ? 1024 molecules
1 mol 6.02 ? 1023 molecules
84.01 g 1 mol
290 g NaHCO3