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Subject: Chemistry 1 The Mole and Avogadro’s number (Notes)

Subject: Chemistry 1 The Mole and Avogadro’s number (Notes). a) How many atoms exist in a molar mass of substance?. Given: 1 amu = 1.6605x10 -24 g. H - Hydrogen. Mass of 1 H=. 1.00. amu. = 1.00amu x 1.6605 x 10 -24 g/amu. = 1.6605 x 10 -24 g/atom. # of atoms in 1.00 g of H=.

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Subject: Chemistry 1 The Mole and Avogadro’s number (Notes)

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  1. Subject: Chemistry 1 The Mole and Avogadro’s number (Notes)

  2. a) How many atoms exist in a molar mass of substance? Given: 1 amu = 1.6605x10-24 g H - Hydrogen Mass of 1 H= 1.00 amu = 1.00amu x 1.6605 x 10-24g/amu = 1.6605 x 10-24 g/atom # of atoms in 1.00 g of H= 1.00 g/1.6605 x 10-24g/atom = = 6.02 x 1023 atoms

  3. a) How many atoms exist in a molar mass of substance? C - Carbon Mass of 1 C= 12.0 amu = 12.0amu x 1.6605 x 10-24g/amu = 1.9926 x 10-23 g/atom # of atoms in 12.0 g of C= 12.0 g/1.9926 x 10-23g/atom = = 6.02 x 1023 atoms Given: 1 amu = 1.6605x10-24 g

  4. b) Avogadro’s Number Mr. Avogadro If we use “gram” as the mass unit in place of “amu” as in the Periodic Table, the number of atoms is always the same: 6.02 x 1023 This number is known as “Avogadro’s number”. The amount of substance involved is called a “mole”

  5. c) The mole = 1 Avogadro’s number of particles A mole of H atoms is 1.0 grams of H A mole of Na atoms is ____ grams of Na. 46 grams of Na is ____ moles of Na. 23 2

  6. c) The mole A mole of H2O molecules is 18 grams of H2O 9 grams of H2O is ____ moles of H2O 36 grams of H2O is ____ moles of H2O .5 2

  7. c) The mole To calculate the number of moles, just divide the mass by the molar mass n = mass/molar mass On October 23rd, at 6:02 Celebrate! Happy Mole Day!

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