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Q. $5$ moles of $SO_2$ and $5$ moles of $O_2$ react in a closed vessel. At equilibrium $60\%$ of the $SO_2$ is consumed. The total number of gaseous moles ($SO_2$, $O_2$ and $SO_3$) in the vessel is

Equilibrium

Solution:

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Total number of moles in the vessel $= 2 + 3.5 + 3 = 8.5$