Răspuns:
Explicație:
1.
ACl= 35 .75,4 : 100 + 37. 24,6 : 100
=26,39 + 9,102
= 35,492
2.
n= m: M
nC= 25g : 12g/moli=2,08 moli C
nS= 25 g : 32g/moli=0,78 moli S
nCa= 25g : 40g/moli= 0,625 moli Ca
3.
m= n . M
m= 4moli . 4g/moli=16 g He
m=4moli . 23g/moli= 92g Na
m=4moli . 31g/moli=124g P
