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A mixture of \( \mathrm{SO}_{3}, \mathrm{SO}_{2} \) and \( \mathrm{O}_{2} \) gases are maintained at equilibrium in 10 litre flask at a temperature at which \( \mathrm{K}_{\mathrm{C}} \) for the reaction \( 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g}) \) is \( 100 \mathrm{~L} / \mathrm{molIf} \) number of moles of \( \mathrm{SO}_{2} \) and \( \mathrm{SO}_{3} \) are same at equilibrium, the number of moles of \( \mathrm{O}_{2} \) present is: .
(A) \( 0.01 \)
(B) \( 0.1 \)
(C) 1
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