5. Question: Magnesium has three naturally occuring isotopes. The masses and % abundances of the isotopes are given in the below. What is the average atomic mass of Mg? Hint: 6. Chapter: 1 Lesson: 1 Hint: Isotope 24Mg Chapter: 1 Lesson: 2 25Mg 26Mg Isotope mass (amu) 23.985 24.986 25.983 % abundance Use E01-1-2: don't forget to convert the % abundances to fractional abundances (decimals). 78.99 10.00 11.01 Question: A student weighs 20 M&Ms and finds that the average weight of a single M&M is 0.8695 g. How many M&Ms are in a 1 lb (453.6 g) bag of M&Ms? Assume that all of the M&Ms have the average mass of a single M&M.

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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.