This book was intended for undergrads. However, I feel this book is more advanced for that unless this is at least your second thermo book. With that said, this is an excellent book on chemical engineering thermodynamics. It has many many excellent sections, and too many too list. But it is not perfect event though it is more perfect than any other graduate level text books I own. Unlike undergraduate text books, graduate text books are never perfect to me. The topics, the depth are never perfect for self study. I alway use one book as a primary source and use a couple of other ones as reference. But I find this book is exceptional and I did not purchase another book on this topic.
The only complain I have about this book is its treatment on entropy. It is too terse and too quick. Entropy is critical for subsequent understanding of Gibbs free energy and so forth. But there is an easy solution. Get yourself Moran's book as a companion to bridge the gap and maybe a few other minor gaps you find here and there.
As a summary, I would not buy this book if this were my first thermo book. I will highly recommend it, however, to people who already know the basics.