Question

Calculati raportul atomic si masa moleculara pentru a)Na2S,b)Ca(OH)2, c)CuCo3

Answer 1

$\bold{a)} \ Na_2S: \\ Masa \ moleculara: \ 23 \cdot 2+32 \cdot 1=46+32=78 ; \\ Raportul \ atomic: \ Na:S=23:32; \\ \bold{b)} \ Ca(OH)_2: \\ Masa \ moleculara: 40 \cdot 1+16 \cdot 2+1 \cdot 2=40+32+2=40+34=74; \\ Raportul \ atomic: Ca:(O:H)=40:(16:1); \\ \bold{c)} \ CuCO_3: \\ Masa \ moleculara: \ 64 \cdot 1+12 \cdot 1+16 \cdot 3=76+48=12; \\ Raportul \ atomic: \ Cu:C:O= 64:12:16.$