Răspuns:
Explicație:
I a) Ra NH3=1:3
b) Ra Ca(NO3)2=1:2:6
c) Ra Ca3(PO4)2=3:2:8
II a) Rm SO3=AS:3AO=32:3*16=32:48=
b) Rm CaCO3=ACa:AC:3AO=40:12: 3*16=40:12:48=
c)Rm Al2(SO4)3=2AAl: 3AS:12AO=2*27:3*32:12*16=54:96:192 =
simplifică
III a) MCaCl2=ACa+2ACl=40+2*35,5=111
111g...40g...71 g
100.....x........y
b) Al2O3 R m=2AAl:3AO=2*27:3*16=54:48=27:24
51 g....27g...24.g
100......x.........y
c) MFe(NO3)3=AFe+3AN+9AO=56+3*14+9*16=56+42+144=242
242g.....56g....42g....144g
100 x y z
aplica regula de 3 simplă și află x,y,z