3*16/62 *100%=77,4. ................
Расставить степень окисления H2S, H2S2, H2SO3, SO3, SO2,SOF2, SF4, SO2F2,SF6 K2SO4, K2S2O7 (SO3)2-, (SO4)2-, (HSO4)-, (HSO3)- (
галина1905
H2S - +1, -2
H2S2 - +1, -1
H2SO3 - +1, 4, -2
SO3 - +6, -2
SO2 - +4, -2
SOF2 - +4, -2, -1
SF4 - +4, -1
SO2F2 - +6, -2, -1
SF6 - +6, -1
K2SO4 - +1, +6, -2
K2S2O7 - +1, +6, -2
(SO3)2- - +4, -2
(SO4)2- - +6, -2
(HSO4)- - +1, +6, -2
(HSO3)- - +1, +4, -2
(S2O7)-2 - +1, +6
(HS)- - +1, -2
FeS2 - +2, -1
NaHSO3 - +1, +1, +4, -2
NaHSO4 - +1, +1, +6, -2
HSO3F - +1, +6, -2, -1
S --> SO₂ --> SO₃ --> H₂SO₄ --> ZnSO₄ --> Zn(NO₃)₂
1) S+O₂-->SO₂
2) 2SO₂+O₂-->(t°) 2SO₃
3) SO₃+H₂O-->H₂SO₄
4) H₂SO₄+Zn-->ZnSO₄+H₂↑
5) ZnSO₄+Ba(NO₃)₂-->Zn(NO₃)₂+BaSO₄↓
Zn²⁺+SO₄²⁻+Ba²⁺+2NO₃⁻ --> Zn²⁺+2NO₃⁻+BaSO₄
SO₄²⁻+Ba²⁺ -->BaSO₄
Mr(NaOH): Ar(Na)=23
Ar(O)=16
Ar(H)=1
Mr(NaOH)=23+16+1=40
Mr(Na₃PO₄): Ar(Na)=23*3=69
Ar(P)=31
Ar(O)=16*4=64
Mr(Na₃PO₄)=69+31+64=164
Mr(Al(OH)₃): Ar(Al)=27
Ar(O)=16*3=48
Ar(H)=1*3=3
Mr(Al(OH)₃)=27+48+3=78