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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Mg + 2HCl = MgCl2+H2
MgO + HCl = VlCl2 + H2O
Но газ выходит только из первые, то бишь H2.
Моли H2 = 4.48/22.4 = 0.2
Соотношение в первой формуле:
x/1=0.2/1
x=0.2
M(Mg)=24
m(Mg)=24*0.2=4.8
10-4.8=5.2
Otvet:
m(MgO)=5.2
m(Mg)=4.8