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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2006

  • question_answer
    4 moles each of \[S{{O}_{2}}\] and \[{{O}_{2}}\] gases are allowed to react to form \[S{{O}_{3}}\] 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

    Correct Answer: A

    Solution :

                                \[2S{{O}_{2}}\,\,\,\,\,\,\,+\,\,\,\,\,\,{{O}_{2}}2S{{O}_{3}}\]
    Initrally 4 4 0
    at equil. 4(1-0.25) 4(1-0.25) \[0.25\times 2\]
        Total number of moles at equilibrium                 = 4(1 - 0.25) + 4(1 - 0.25) + 0.5                 = 4 - 1 + 4 - 1 + 0.5 = 6.5


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