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.
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) =