1. Answer the following: a. If a car has an EPA mileage rating of 30.0 miles per gallon, what is this rating in m L-1? (1 gallon = 3.785 liter, 1 mile = 1.609 meter.) b. Given the isotopic abundance and mass, what is the atomic mass of Boron?     Isotope     Mass (amu)  Abundance (%)        B-10           10.013                  19.9        B-11           11.009                  80.1 c. A solution has a [H+] of 2.5 ×10-3 M.  What is the pH of this solution?

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.