0,2 x
H2SO4+K2CO3=K2SO4+CO2+H2O
1 1
m(K2CO3)=m(р-ра)хω=110х0,25=27,5 г.
n(K2CO3)=m/M=27,5÷138=0,2 моль
n(CO2)=x=0,2х1÷1=0,2моль
V(CO2)=Vmхn=22,4л./моль×0,2моль=4,48л.
ответ: 4,48л.
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Fe⁰+Br₂⁰→Fe⁺³Br₃
⁻
Fe⁰-3e⁻→Fe⁺³ 3 2
6
2Br⁰+2xe⁻→2Br
⁻ 2 3
Fe⁰ восстановитель
Br⁰ окислитель
2Fe+3Br₂=2FeBr₃
Zn⁰-2e⁻→Zn⁺² 2 2
4
2O⁰ +2x2e⁻→O
⁻² 4 1
Zn⁰восстановитель
O⁰окислитель
2Zn+O₂=2ZnO
Pb⁺²O+H₂⁰→Pb⁰+H₂⁺O
Pb⁺² +2e⁻→Pb⁰ 2 1
2
2H⁰-2xe⁻→H⁺ 2 1
Pb⁺²окислитель
H⁰восстановитель
PbO+H₂=Pb+H₂O