Question

Calculeaza numarul total de electroni in 234g saramura de concentratie 10%!!!! URGENT 20 PCT +COROANA

Answer 1

1at Na are 11e,  1 at Cl are 17e---> in 1 molecula NaCl sunt 28 e
n,mol= N/Na
N=28x6.023x10²³ e= 168,6x10²³ e

M,NaCl= 58,5g/mol
-calculez masa de NaCl dizolvata in solutie
c/100= md/ms
10/100= md/234----> md= 23,4g NaCl
-calculez moli NaCl
n(niu)= m/M
n= 23,4g/58,5g/mol=0,4mol NaCl
-calculez nr.e din 0,4mol NaCl
1mol........168,6x10²³ e
0,4mol.............x...........................calculeaza  !!!!