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 :Moles of `O_(2)` used up = 25 % of 4 = 1 mol.
`{:(,2SO_(2),+,O_(2),hArr,2SO_(3)),("Initial moles",4,,4,,0),("Moles at eqm.",4-2,,4-1,,),(,=2,,=3,,2):}`
Therefore total NUMBER of moels of all gases at
eqm. = 2+3+2 = 7


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