Question

Calculati numarul de electroni din invelisul electronic al atomilor aflati in:
a.2,3 g Na
b.0,27 g Al
c.120 g C

Answer 1

A Na= 23g/mol     Z Na=11  ==>11e⁻ in invelisul electronic
 23 g Na reprezinta un mol
-in 23g Na exista 6,023*10²³ atomi Na...si......11*6,023*10²³e⁻
     2,3g Na..........................................................x=2,3*11*6,023*10²³e⁻ /23=......E

A Al=27..si reprezinta..1mol atomi Al
Z Al=13===>13 e⁻
27 g Al(un mol)    exista 6,023*10²³ atomi Al... si 13 * 6,023*10²³e⁻
0,27 g Al........................................................y= 0,27*13*6,023*10²³e⁻=...

A C=12
Z C=6 =====> 6e⁻
12gC contin 6,023*10²³ atomi C........6*6,023*10²³e⁻
120gC.................................................z=120*6*6,023*10²³/12=......e⁻