Review of Fundamentals

Review of Fundamentals - Review of Fundamentals The Mole A...

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The Mole A mole is a unit for counting atoms, molecules, ions, electrons, etc. It is used in the same sense that a dozen is a convenient unit for donuts, eggs, etc. One dozen is a small integer number because donuts, eggs, etc, are large objects. One mole is a large integer because atoms, molecules, ions, electrons, etc, are really small objects. The international convention is that a mole is equal to the number of atoms contained in an exactly 12 gram sample of pure 12 C isotope. With this definition of a mole we further define: Gram Atomic Weight: weight of one mole of atoms. For example, Carbon has a gram atomic weight of 12.011 Gram Molecular Weight: weight of one mole of molecules. For example, CO 2 has a gram molecular weight of 44.01 Gram Formula Weight: weight of one mole of a given stoichiometry. For example, NaCl has a gram formula weight of 58.44. NaCl is not really a molecule so we use the more general term formula. Concentration Units Molarity A concentration given in units of molarity is calculated according to: The unit volume is most commonly in liters. The abbreviation for molarity is M . helpful hint:
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Review of Fundamentals - Review of Fundamentals The Mole A...

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