I've never read a book with so many errors! The author is listed also as the editor, which I can see is a problem. One or two errors would have been understandable, but there are a few in just about every chapter! And it's a shame because the writing is actually very good in explaining science concepts. I probably would have otherwise given this book 4 stars. However, constantly having to second-guess my answers in the molar-mass section, for example, was extrememly frustrating because of the errors with the exponents. I didn't know if my answers were wrong or the author's were. The errors don't give you a lot of confidence in the book.