68. The reaction rate constant
  (CH3CO) 2O (f.) + H2O (g.) ↔ 2SN3SOON (g.)
at 15 ° C was 0.0454 min-1. The initial concentration of acetic anhydride was 0.5 mol / l. Determine the reaction rate at the time when the concentration of acetic acid sta¬net of 0.1 mol / l.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)