A DOZEN roses = 12 roses. A PAIR of shoes = 2 shoes. a DOZEN eggs = 12 eggs. a REAM of paper = 500 sheets. A GROSS of pencils = 144 pencils. A SIX –PACK of beer = 6 cans. TRIO. QUARTET.
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However a mole is MUCH bigger than 12
...it is 602 sextillion.
Obviously a mole of chemistry problems is way too many problems.
The mole is typically used for counting or grouping
very very small things, like
1. The mole is an SI unit that allows us to count # of:
3. The number is called “Avogadro’s number”
in honor of the Italian scientist
1 mole of anything=6.02 x 1023
2. MOLECULES (_______compounds –
all elements are non metals)
EX: CO2, NO2, C12H22O11
3. Formula Units(_____compounds – at leastone element must be a metal)
EX: NaCl, CuCl2, FeO
MASS of a dozen limes = MASS of a dozen cars
MASS of a mole carbon = MASS of a mole copper
6.02 x 1023 Catoms = 6.02 x1023 Cu atoms
Molar Mass (MM) = Atomic mass (AM)
EX: Mn - 54.94 amu = 54.94 g/mol
AM 26.98 g =
MM 26.98 g/mol
# of atoms = # of moles
2. 1 mole of CO2:
AM (C) = 12.011 amu = MM
AM (O) = 16.00 amu x 2 = MM
12.011 + 2 (16.00) = 44.01 g/mole
AM (Cu) 63.546 amu = MM g/mole
AM (N) 14 x 2 amu = MM g/mole
AM (O) 16 x 4 amu = MM g/mole
63.546 + 2(14) + 4 (16) =