Chapter 10 - The Mole & Avogadro’s Number. Measuring Matter Sections 10.1 10.3. Measuring Matter/Counting Units. One pair = 2 (boots, shoes) One dozen = 12 (eggs, donuts, roses) One gross = 144 (pencils) One ream = 500 (sheets of paper).
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Sections 10.1 10.3
One pair = 2
One dozen = 12 (eggs, donuts, roses)
One gross = 144 (pencils)
One ream = 500 (sheets of paper)
surface of the Earth to a depth of six miles
One mole of stacked pennies would reach to the moon and back 16 times
would cover the United States
to a depth of 650 miles
Mass of reactants = mass of products
Mass of starting substances = mass of ending substances
two atoms of hydrogen + one atom of oxygen 1 water molecule
12.04x1023 hydrogen atoms + 6.02x1023 oxygen atoms
6.02x1023 water molecules
The atomic mass ratio of hydrogen to oxygen is 1 amu : 16 amu
The gram mole ratio between hydrogen and oxygen is 1 g : 16 g
So, chemists can determine how many atoms are present in a sample.
One gram of hydrogen would contain exactly 6.02x1023 atoms, or Avogadro’s Number of atoms. Two grams of hydrogen atoms would contain 12.04x1023 hydrogen atoms.
Also, 16 gram moles of oxygen would contain 6.02x1023 atoms.
Therefore: 1 gram of hydrogen = 6.02x1023 atoms = 1 mole
2 grams of hydrogen = 12.04x1023 atoms = 2 moles
16 grams of oxygen = 6.02x1023 atoms = 1 mole
32 grams of oxygen = 12.04x1023 atoms = 2 moles
3) 2.7 moles of lithium
4) 1.8 moles of sodium chloride
5) 5.3 moles of bromine
6) 4.7 moles of potassium oxide
7) 4.32 x 1024 atoms of calcium
8) 2.7 x 1020 atoms of copper
9) 2.5 x 1024 molecules of sodium chloride
10) 5.32 x 1023 molecules of calcium chloride
11) 25 moles to particles
12) 4.08 x 104 particles to moles
13) 0.002 moles to particles
14) 2.3 x 1016 particles
Particles to moles5) 4.32 X 1024
6) 2.70 X 1020 7) 2.50 X 1024 8) 5.32 X 1023
Moles to particles