The Church does not exist to dispense chemical equations. But your question is not based upon reason. Probably Sodom and Gomorrah were destroyed by natural agencies set in movement by God, with earthquakes and volcanic eruptions. Rock-salt abounds in that region, and an upheaval of that material could easily have overwhelmed and embedded Lot’s wife because of her delay, leaving a standing hillock of salt as her memorial.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty