A one litre vessel at equilibrium contain 2 mole each of SO2,SO3 and one mole of O2.[2SO2+O2⇌2SO3] . To increase the conc. of SO3 to 2M to 3 M the number of mole of O2 to be added to the system at the same temperature is

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0.5

1.25

3.5

8.5

answer is B.

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Detailed Solution

2SO2 + O2 ⇌ 2SO3 2 1 2 At Equilibrium KC=(SO3)2(SO2)2(O2)=2222x1=1 KC=(SO3)2(SO2)2(SO2)=(3)2(22)(O2)=1 [O2]=94=2.25 Extra to be added=1.25 moles

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