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. 7.0
C. 8.0
D. 2.0
Answer» C. 8.0


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