👤

Scrie raportul atomic, raportul de masa si compozitia procentuala a urmatoarelor elemente: Mg3 (PO4)2 , H2 S si Mn2 O7

Răspuns :

Mg3(PO4)2
raport atomic=Mg:P:O=3:2;8
raport de masa = Mg:P:O=72: 62:128=36:31:64
compozitie procentuala
MMg3(PO4)2=3×AMg+2×AP+8×AO=72+62+128=262
262gMg3(PO4)2.....72gMg......62gP.......128gO
100gMg3(PO4)2......xgMg........ygP............zgO
x=100×72/262=calculeaza
y=100×62/262=calculeaza
z=100×128/262=calculeaza
H2S
raport atomic=H:S=2:1
raport de masa=H:S=2:32=1:16
Copozitie procentuala
MH2S=2×AH+AS=2×1+32=34g
34gH2S.........2gH...............32gS
100gH2S........xgH..............zgS
x=100×2/34=calculeaza
z=100×32/34=calculeaza
Mn2O7
raport atomic=Mn:O=2:7
raport de masa=Mn:O=110:112
compozitie procentuala
MMn2O7=2×AMn+7×AO=2×55+7×16=222g
222gMn2O7.........110gMn........112gO
100gMn2O7............xgMn............ygO
x=100×110/222=calculeaza
z=100×112/222=calculeaza