This solutions manual provides the authors' detailed solutions to exercises and problems in the seventh edition of "Physical Chemistry" by Peter Atkins and Julio de Paula. The manual is intended for students and instructors alike and comprises: solutions to the 'A' exercises at the end of each chapter; solutions to selected numerical, theoretical and additional problems at the end of each chapter; helpful comments that aid the student's understanding of selected solutions; and friendly guidance from the authors in the working of each solution.