1.

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

Answer»

`6.5`
`7.0`
`8.0`
`2.0`

Solution :`{:(,2SO_(2),+,O_(2),hArr,2SO_(3)),("Initil moles",4,,4,,0),("Moles at EQM.",4(1-0.25),,4(1-0.25),,0.25xx2):}`
Total number of moles
`=4(1-0.25)+4(1-0.25)+0.5`
`=4-1+4-1+0.5=6.5`


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