Question

REPEDE!!!!Va rog!!!Cu explicatii ca sa inteleg !!!!
1.Cati atomi de zinc se gasesc in 7 moli de atomi de zinc?
2.Cati moli de acid clorhidric reprezinta 365g acid clorhidric?
3.Cati neutroni se gasesc in a)10g carbon
b)12g magneziu
4.Care este procentul de carbon din metan, carbon de potasiu

Answer 1

1. nr.at. = n·N Av. = 7·6,023·10²³ = 42,161·10²³ atomi Zn
2.  n m/M = 365/36,5 = 10 moli
3. a) n = 10/12 = 5/6 moli = 5/6 ·6,022·10²³ atomi = 5,018·10²³ atomi
1atom( nucleu) C......contine .........6 neutroni
5,018·10²³......................................x = 30,11·10²³ neutroni
b) Z Mg = 12    n = 12/24 = 0,5 moli    nr. at. = 0,5·6,022·10²³ = 3,011·10²³
1atom................12 neutroni
3,011·10²³................x = 36,132·10²³ neutroni
4.  %C = mC·100/M
CH4    %C = 12·100/16 = 75%
K2CO3    %C = 12·100/126 = 9,5238%