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Q 1118712600.     2 mol of `SO_2` and 1 mol of `O_2` are heated in a closed vessel to reach the equilibrium:
`2SO_2 (g) + O_2 (g) ⇌ 2 SO_3 (g)`.
The equilibrium mixture exerted a pressure of 5 atm and required 1/3 mol of `K_2Cr_2O_7` in acidic medium. Find the `K_p` for the reaction.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)