STOICHIOMETRY CHEMICAL CALCULATIONS Dr. M. Abd-Elhakeem Faculty of Biotechnology General Chemistry Lecture 4.
1 Section 7.1 The Mole: A Measurement of Matter n OBJECTIVES: –Describe how Avogadro’s number is related to a mole of any substance. –Calculate the mass.
1 Empirical formula: 2 Hydroquinone, used as a photographic developer is 65.4% C, 5.5% H, and 29.1% O, by mass. What is the empirical formula? If we.
1 Chapter 4 Problem Solving in Chemistry. 2 Section 4.1 What Do I Do Now? n OBJECTIVES: –List several useful problem-solving skills.
1 Chapter 3 Problem Solving in Chemistry G. Holmes Braddock High School Mr. Glass.