This is a bit of a trick question! "Mon" isn't a standard unit of weight. Here's why:

* Ton: A ton is a unit of weight, usually referring to a short ton (2000 pounds) or a metric ton (1000 kilograms).

* Mon: There is no common unit of weight called "mon." It's possible this is a misspelling or a word used in a specific context.

If you can provide more information about what "mon" refers to, I might be able to help!