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Molar Mass: Calculations & Conversions

Explore molar mass concepts, isotopes, and conversions in chemistry. Practice problems included for hands-on learning. Determine moles, atoms, and grams accurately using atomic mass units.

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Molar Mass: Calculations & Conversions

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  1. Mass and moles

  2. B. Molar Mass • The mass of 1 mole of atoms • Isotopes have different masses so the periodic table is an average. • That’s why they have decimals. • Atomic mass tells the... • atomic mass units per atom (amu) • grams per mole (g/mol) • Round to 2 decimal places

  3. B. Molar Mass Examples 12.01 g/mol 26.98 g/mol 65.39 g/mol • carbon • aluminum • zinc

  4. B. Molar Mass • Mass of 1 mole of an element or compound. • Molar mass = 1 mole = 6.02 x 1023 atoms • So, how many atoms are in 12g of carbon and 16g of oxygen?

  5. 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

  6. C. Molar Conversion Examples • How many grams of Sodium are present in 2.8 mol Sodium? 2.8 mol Na 22.99 g Na 1 mol Na =64 g Na

  7. Practice • How many grams are in 4.60 moles of magnesium? • How many moles are in 273.6 grams of nitrogen? • How many atoms are in 43.0 grams of aluminum? • How many grams are in 8.36 x 1023 atoms of carbon? 112 g Mg 19.53 moles N 9.59 x 1023atoms Al 16.7 grams C

  8. Practice • How many atoms are in 43.0 grams of aluminum? • How many grams are in 8.36 x 1023 atoms of carbon? 9.59 x 1023atoms Al 16.7 grams C

  9. Homework Tonight Determine if you are using grams or atoms. 1 mole = 6.02 X 1023 atoms or molecules 1 mole = # grams from periodic table Warning! You MAY need to use BOTH! Follow your units...they will show you the way

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