Răspuns:
MCa=40g/mol
MCaCl2=40+2x35,5=111g/mol
40g....................111g
Ca + Cl2 → CaCl2
10g......................xg
x=10x111/40=27,75g CaCl2
calculam in moli
n=m/M=10/40=0,25moli Ca
1mol..........1mol
Ca + Cl2 → CaCl2
0,25moli....ymoli
y=0,25x1/1=0,25moli
Explicație:
