Why does chopin introduce the reader to her protagonist as “mrs. mallard” rather than by her first name?

Kate Chopin decided to introduce the protagonist as Mrs. Mallard rather than by her first name because she is an unhappy woman who is trapped in her marriage. She cannot set herself free and endures it until she receives the news that her husband has died in a train crash.

Initially she feels grief, followed by thoughts of freedom and years of happiness for herself, until her husband shows up and causes her a heart attack. In the end, she dies and we learn her first name: Louis.  

ieoiw what en the: enswer is b

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.