MASS <--->MOLES<---->VOLUME
^
MOLECULES
v
ATOMS
Today in class we learned about 2 new conversions, going from moles to molechules, and then as well as an extra step to atoms.
The conversion factor between moles and molechules is avogadro's number as shown below.
What the pictures doesnt show though is that for atoms we have to multiply by the subscripts. (an extra step)
Some Practice:
O(little2) <--- 2 atoms of Oxygen per molechule
Al <---- 1 atom of aluminum per molecule (the extra step isn't necessary)
So now for some actual conversions...
EXAMPLES:
1. Determine the number of atoms that are in 0.58 mol of Se
0.58 mol . 6.02 x 10^23 = 3.49 x 10^23 atoms
1 mol
2. Determine the number of atoms that are in 1.25 mol of O(little 2) (oxygen gas)
1.25 mol . 6.02 x 10^23 (x2) = 1.5 x 10^23
1 mol
for this example we multiplied the number by 2 at the end, because there are 2 atoms in every oxygen gas molechules
**remember to include significant figures, and to use the second "EE" function on your calculator (or brackets)
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