Odpowiedź :
[tex]dane:\\V = 1 \ cm^{3}\\\rho = 8,9\frac{g}{cm^{3}}\\M = 63,54\frac{g}{mol}\\N_{a} = 6,02\cdot10^{23}\frac{at}{mol}\\szukane:\\N = ?\\\\Rozwiazanie\\\\n = \frac{m}{M} = \frac{V\cdot \rho}{M}\\oraz\\n = \frac{N}{N_{a}}\\\\\frac{N}{N_{a}} = \frac{V\cdot \rho}{M}\\\\N = \frac{V\cdot \rho \cdot N_{a}}{M}\\\\N = \frac{1 \ cm^{3}\cdot8,9g/cm^{3}\cdot6,02\cdot10^{23}at/mol}{63,54g/mol}\\\\N \approx 0,843\cdot10^{23} \ atomow \approx 8,43\cdot10^{22} \ atmomow \ Cu.[/tex]
[tex]V=1cm^3\\\mu = 63,54\frac{g}{mol}\\d=8,9\frac{g}{cm^3}\\N_A=6,022*10^{23}\frac{1}{mol}\\N=?[/tex]
[tex]n=\frac{N}{N_A}\rightarrow N=N_A*n[/tex]
[tex]n=\frac{m}{\mu}[/tex]
[tex]m= d * V[/tex]
[tex]N=N_A * \frac{d * V}{\mu}[/tex]
[tex]N = 6,022 * 10^{23}\frac{1}{mol} * \frac{8,9\frac{g}{cm^3}*1 cm ^3}{63,54\frac{g}{mol}}= 8,43*10^{22}[/tex]