One does not know, but can you pray for people who are are destined for hell? Can you pray for those spirits (devils) who have chosen hell? For with God, all things are possible!
The following link should assist you in better understanding the Catholic Church’s teaching on praying for souls in Hell. If you have any further questions or concerns that are not answered by these links, please [contact Catholic Answers (http://www.catholic.com/home/contact.asp) directly.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.
