Answer:
0.0494×6.02.10
23
= 2.974.10²²atoms
Step-by-step explanation:
A mole is the number of particles (atoms, molecules, ions) contained in a substance that is the same amount as many atoms in 12 gr C-12
1 mole = 6.02.10²³ particles
N = n x No
No = 6.02.10²³ = Avogadro's number
mol of Cu :
\begin{gathered}\tt atomic~mass~of~Cu=63.5~g/mol\\\\mol~Cu=\dfrac{3.14}{63.5}=0.0494\end{gathered}
atomic mass of Cu=63.5 g/mol
mol Cu=
63.5
3.14=0.0494
The number of atoms :
\tt 0.0494\times 6.02.10^{23}=\boxed{\bold{2.974.10^{22}~atoms}}0.0494×6.02.10 23= 2.974.10²² atoms