BASED ON FORMULAE
7.5 - Calculations involving Avogadro's number
7.5.3 - Mass in grams
to number of particles conversion
Whenever you want to convert quantities from one unit to
another, you need to use the appropriate conversion factor. The conversion
factor must have units of the two quantities involved.
To convert between mass in grams
and number of particles*
it will require two steps as there is not a single quantity that
relates these two units.
||Convert the mass in grams to
moles. This step is explained in detail in
|Convert the calculated quantity from step 1 in moles
to the number of particles. This step is explained
in detail in section 7.5.2.
How many oxygen atoms are there in 5.0
grams of Na2CO3?
These are the steps that I would take to
answer the question.
Step 1: How many moles
of Na2CO3 are
there in 5.0 grams of Na2CO3?
Step 2: In this many moles
of Na2CO3, as calculated
in step 1, how many moles of oxygen atoms are there?
In this many moles of oxygen, as calculated in step 2, how many oxygen atoms
of Moles of Units. Avogadro's Number (N) ..p189