Question

99PCT!Doua elemente vecine in sistemul periodic au impreuna in nucleele lor atomice 31 protoni.Cati electroni se gasesc intr-un amestec echimolar al celor doua elemente, care cantareste 200g.
*am aflat elementele, sunt Z=15 (fosfor) si Z=16 (sulf), dar nu stiu ce trebuie sa fac mai departe, m-ar ajuta foarte mult o indicatie*

Answer 1

Z1+Z2=31

P, Z=15 

S, Z=16 

MP=31g/mol
MS=32g/mol

31x+32y=200 =>31x+32x=200=>63x=200=>x=200/63=>x=3,1746 moli (x+y)
x=y

1 mol amestec.................................2*6,023*10^23 electroni
3,1746 moli amestec..........................x electroni

x=2*6,023*3,1746=38,241*10^23 electroni..

Parerea mea..