/usr/lib/freefoam/libchemistryModel.so is in libfreefoam-dev 0.1.0+dfsg-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/freefoam/libchemistryModel.so.1
/usr/lib/freefoam/libchemistryModel.so.1