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The Mole

The Mole. Chemistry SOL 1.g.14; 4.a.1-6. Chemical Measurements. Atomic Mass The weighted average of the masses of existing isotopes of an element Measured in atomic mass units (amu). Formula Mass The sum of the atomic masses of all atoms in a compound as represented in a chemical formula.

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The Mole

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  1. The Mole Chemistry SOL 1.g.14; 4.a.1-6

  2. Chemical Measurements Atomic Mass • The weighted average of the masses of existing isotopes of an element • Measured in atomic mass units (amu)

  3. Formula Mass • The sum of the atomic masses of all atoms in a compound as represented in a chemical formula

  4. What is the formula mass for acetic acid (HC2H3O2)? H – 4 x 1.01 amu = 4.04 amu C – 2 x 12.01 amu = 24.02 amu O – 2 x 16.00 amu = 32.00 amu 60.06 amu

  5. Molar Mass The mass in grams of one mole of a substance is the molar mass. The molar mass of a substance can be determined from its atomic mass or formula mass. What is the molar mass of acetic acid? 60.06 amu = 60.06 g/mol

  6. What is a Mole? Mole Just as a dozen eggs represents 12 eggs, a mole of a substance represents 6.02 x 1023 representative particles of that substance. The experimentally determined number 6.02 x 1023 is called Avogadro’s number.

  7. Representative particle refers to the species present in a substance: usually atoms, molecules, or formula units.

  8. Atoms & Moles The number of atoms in one mole of an element is always equal to 6.02 x 1023 atoms.

  9. Molecule & Moles If a substance exists in a molecule form because its atoms are joined by covalent bonds, then its smallest particle is a molecule. The number of molecules in one mole of a molecular substance is always equal to 6.02 x 1023 molecules.

  10. Formula Units & Moles If a substance is an ionic compound, it is represented by a formula unit. The formula unit is the lowest whole-number ratio of elements in an ionic compound. The number of formula units in one mole of an ionic compound is always equal to 6.02 x 1023 formula units.

  11. Mole Conversions Mass & Moles The mole is the central unit in converting the amount of a substance from one type of measurement to another.

  12. Converting to Mass & Moles mol/g Mass Moles g/mol

  13. 1. How many moles are in 11.2 grams of NaCl?

  14. 2. How many grams are in 2.50 moles of NaCl?

  15. Converting to Particles & Moles Moles 6.02x1023 particles/mol Particles mol/6.02x1023 particles Particles = Atoms OR Formula Units OR Molecules

  16. 3. How many moles of barium nitrate (BaNO3) are in 6.80 x 1023 formula units?

  17. 4. Determine the number of atoms in 0.36 moles of Al.

  18. Multi-step Conversions Mass Particles Molar Mass # of Particles in 1 mole Moles

  19. 5. How many formula units of NaHCO3 are in 1.8 g of sodium bicarbonate (baking soda)?

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