H2+CI2=2HCI
V(H2):V(HCI)=1:2
V(HCI)=20*2=40л
2
M(SO3)=80
D(H2)=80/2=40
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H2+O2=2H2O
V(O2):V(H2O)=1:2
V(H2O)=15*2=30л
2
M(SO2)=64
D(O2)=64/32=2
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2SO2+O2=2SO3
n(SO2:)n(O2)=2:1
n(O2)=5/2=2,5моль
V(O2)=22,4*2,5=56л