Thanks for the reply and the link Borek. That is a great resource that I will make use of. I've actually spent a considerable amount of time on the problem before I posted, just didn't include my calculations due to time restraints. The post was more to check my answers with those who are more adept than I when it comes to Chem. I believe I'm on the right track though. I'm a little stuck on the second part of the problem but I think I can figure it out in due time. Thanks again for the link and your time...W