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5 moles of SO(2) and 5 moles of O(2) are...

5 moles of `SO_(2)` and 5 moles of `O_(2)` are allowed to react to form `SO_(3)` in a closed vessel. At the equilibrium stage `60%` of `SO_(2)` is used up. The total number of moles of `SO_(2), O_(2)` and `SO_(3)` in the vessel now is

A

5.1

B

3.9

C

10.5

D

8.5

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