Question

Faceți 3 compoziții procentuale la alegere: Al 3 S 3; Ca (HS)2; Li 2 O; Fe 2 (SO 4) 3; H 3 PO; Hg O.

Answer 1

Al2S3
Compozitie procentuala
MAl2S3=2×AAl+3×AS=2×27+3×32=150g
150gAl2S3....54gAl.....96gS
100gAl2S3.....xgAl.......ygS
x=100×54/150=calculeaza
y=100×96/150=calculeaza
Li2O
Mli2O=2×ALi+AO=2×7+32=46g
46gLi2O.....14gLi.....32gO
100gLi2O.....xgLi.....ygO
x=100×14/46=calculeaza
y=100×32/46=calculeaza
H3PO4
MH3PO4=3×AH+AP+4×AO=3×1+31+4×16=98g
98gH3PO4..........3gH.....31gP.......64gO
100gH3PO4........xgH.....ygP..........zgO
x=100×3/98=calculeaza
y=100×31/98=calculeaza
z=100×64/98=calculeaza