4 moles each of SO2 and O2 gases are allowed to react to form SO3 in a – McqOptions

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1.	4 moles each of SO2 and O2 gases are allowed to react to form SO3 in a closed vessel. At equilibrium 25% of O2 is used up. The total number of moles of all the gases present at equilibrium is?
A.	6.5
B.	8.0
C.	7.0
D.	2.0
Answer» D. 2.0

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