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2SO2 + O2 ---> 2SO3
[SO2]= 5mol/dm3
[O2]=3mol/dm3
v1=k*(5)^2 *3 = k*25*3=75k
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[SO2]'= 2mol/dm3
2mol SO2 -------1 mol O2
3 mol So2 ---------x
x= 1,5 mol O2
[O2]'=3-1,5=1,5 mol/dm3
v2=k*(2)^2 *1,5 = 6 k
v1/v2 = 75k/6k=12,5
czyli szybkośc reakcji zmaleje 12,5 razy