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27.06.2019 •
Mathematics
How many atoms are there in a 5.2-g copper
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Ответ:
There are
copper atoms in 5.2 gram of metallic copper.
Step-by-step explanation:
Start by finding the number of moles of copper atoms in that 5.2 gram of metallic copper. Look up the relative atomic mass of copper on a modern periodic table.
Cu: 63.546.In other words, the mass of one mole of copper atoms is 63.546 gram.
How many moles of copper atoms in that 5.2 gram sample?
Now, how many atoms is
?
The Avogadro's Number gives the number of particles in one mole:
There are
particles (a very large number) in one mole.
of copper atoms will thus contain
copper atoms.
Ответ:
It would be 18 to the nearest hundredth percent