Posted by bre bre on Tuesday, March 10, 2009 at 6:45pm.
There are 6.02 x 10^23 molecules in a mole of molecules or atoms in a mole of atoms. Here is how you do the first one.
3.161 x 10^21 molecules CO2 x (1 mole CO2 molecules/6.02 x 10^23 molecules CO2) x (2 atoms O/1 molecule CO2) = ?? moles O atoms in 3.161 x 10^23 molecules CO2.
The others are done the same way. Note the use of the factors. They all work this way, even with different problems (of course the factors are different for different kinds of problems).
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