question_answer

5 moles of \[\text{S}{{\text{O}}_{\text{2}}}\]and 5 moles of \[{{\text{O}}_{2}}\] are allowed to react to form\[\text{S}{{\text{O}}_{\text{3}}}\]in a closed vessel. At the equilibrium stage 60% of \[\text{S}{{\text{O}}_{2}}\]is used up. The total number of moles of\[\text{S}{{\text{O}}_{\text{2}}}\text{,}{{\text{O}}_{\text{2}}}\]and\[\text{S}{{\text{O}}_{\text{3}}}\]in the vessel now is:

A)  \[10.0\]                              

B) \[8.5\]

C)  \[10.5\]                              

D)  \[3.9\]