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The atomic masses of all the elements that are listed on the periodic table are all based on a standard in that standard is
the carbon 12 standard
when you count the number of atoms in 12 g of a pure sample of carbon 12
that number of atoms works out to be 6.022 times 10 to the 23rd
which is called of a guide rose number
which is also called a mole of atoms
so the value on the periodic table the atomic mass
is also the molar mats
the value is exactly the same but we change the units from a and use which are not very useful in
the Chem lab we change them to a more useful unit of Grams
so for example the value for carbon of the parent table as call 0.01 that means 12.01
Grams of carbon are equal 21 mole of and actually turning sample of carbon
that contains all of the isotopes of carbon
that means we now have an you conversion factor
we can turn moles of atoms into a mass or we can turn a mass in two moles of atoms
so for example we can calculate
the number of carbon atoms and three men have towns and graphite
using that periodic table value
so the unknown with try to calculate is the number of carbon atoms the known as 3 1/2 pounds
and we can turn pounds of carbon into Grams of carbon
then we can turn Grams of carbon into moles of carbon
and moles of carbon can be turned into a number of atoms
to pound the Gramm conversion
1 pound is just under 454
Grams
Grams of carbon into moles of carbon we get this conversion factor
from the periodic table the molar mass of carbon
one mole of carbon the value on the periodic table 12.01 g
and then one mole of anything
is always a that grows number
6.022 times than the 23rd atoms are
some of applying this out we get a huge number 7.96
times 10 to the 25th
atoms