chemical quantities chapter 10.1. ways to measure matter length/width/height volume density surface...
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Chemical quantities
Chapter 10.1
Ways to measure matter
• Length/width/height• Volume• Density• Surface Area• Etc.
THE MOLE•THE SI UNIT FOR MEASURING THE AMOUNT OF A SUBSTANCE IS A MOLE.
Determining the amount of atoms in a
mole• NaCl has 2 atoms• MgO has 2 atoms• PF3 has 4 atoms
• 1 phosphorus • 3 fluorines
• C6H12O6 has 24 atoms in it• 6 carbons• 12 hydrogens• 6 oxygens
Representative Particles
• Atomic oxygen• O• 16.00 grams in one mole
• Oxygen Gas• O2
• 32 grams in one mole (2 atoms x 16)
Representative particles
• Sodium Ion• Na+• 22.99 g
• Sodium Chloride• NaCl• 22.99 g (Na) + 35.45 g (Cl)
Atomic mass• How many grams in 1 mole of
that element• OR• How many grams in 6.022 x
1023 atoms of that element
Atomic masses of elements
•Are based on the mass of the carbon isotope Carbon-12
Sulfur Trioxide• 1 x S = 1 x 32.1 = 32.1 amu• 3 x O = 3 x 16 = 48 amu• 48 amu + 32.1 amu = 80.1 amu• The atomic mass of a SO3 atom is 80
amu.
On your own:• H2O
• NH3
• PF3
• NaCl• C6H12O6
Molar Mass• The molar mass of a
compound is the mass of 6.02 x 1023 molecules of that compound.
• EX: The molar mass of H2O is 18.02 grams.
True or False?•Molar masses can be calculated directly from atomic masses expressed in grams.
•TRUE!
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