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4 moles each of SO(2) "and" O(2) gases a...

4 moles each of `SO_(2) "and" O_(2)` gases are allowed to react to form `SO_(3)` in a closed vessel. At equilibrium 25% of `O_(2)` is used up. The total number of moles of all the gases at equilibrium is

A

`6.5 `

B

`7.0`

C

`8.0`

D

`2.0`

Text Solution

Verified by Experts

The correct Answer is:
B
`2SO_(2) +O_(2) hArr 2SO_3`
`{:("Initial moles",4,4,0),("Final Moles." ,(4 – 2) ,(4 – 1) ,2),((25%O_2 "consumed") ,"=2","=3","=2"):}`
Total number of moles = 2 + 3 + 2 = 7.
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