Owl 24-Months Printed Access Card for Zumdahl/Decoste's Chemical Principles

24-Month Access Code for General Chemistry OWL. Includes access to the Cengage YouBook for Chemical Principles, Seventh Edition by Zumdahl and DeCoste. The code on this card gives you access to: - OWL assignments that your professor has selected for your course - The Cengage YouBook, a digital version of the entire textbook, including end-of-chapter questions. OWL tells you exactly which sections of the Cengage YouBook to read for help in mastering specific assignments.