A
definition of the kilogram by means of Avogadro number and dalton.
by
Cesare Curti
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Used
symbols |
|
|
|
|
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Avogadro number …………………………... |
N |
|
dalton
………………………………………. kilodalton …………………………………… |
u Ku |
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gram ……………………………………........ kilogram …………………………………….. |
g Kg |
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carbon 12 …………………………………… mole …………………………………………
|
12C mol |
Definitions:
1)
The
dalton is the twelfth part of the mass of an atom of 12C
2)
N =
6,02214199 1023
3)
1Kg = N Ku
From
these definitions it comes down:
1)
1g = N u
2)
12g = N12u
3)
12 g
of 12C contain N atoms of 12C
4) The molar mass of 12C is 12 g mol-1
Bologna,
sabato 5 luglio 2003