Question

calculati nr atomilor din 56 gr N

Answer 1

n=56/28=2 moli
n=N/NA
N=nxNA
N=2x6.022x10^23
N=12.044x10^23 atomi N

Answer 2

m = 56 g

M = 2A N = 2 * 14 = 28 g/mol (masa moleculara)

Deci, avem 56 : 28 = 2 moli N2

Stim ca :

1 mol N2 .................. 6,023 * 10^23 atomi N2
2 moli N2 ................. x atomi N2

x = 2 * 6,023 * 10^23
x = 12,046 * 10^23 atomi N2