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-- Adapted from Nivaldo J. Tro’s best-selling general chemistry text, Principles of Chemistry: A Molecular Approach focuses exclusively on the core concepts of general chemistry without sacrificing depth or relevance. Tro's unprecedented two- and three-column problem-solving approach is used throughout to give students sufficient practice in this fundamental skill. A unique integration of macroscopic, molecular, and symbolic illustrations help students to visualize the various dimensions of chemistry; and Tro’s engaging writing style captures students' attention with relevant applications. The Second Edition offers a wealth of new and revised problems, approximately 50 new conceptual connections, a new design and revised art program throughout, and is available with MasteringChemistry®, the most advanced online tutorial and assessment program available.