A mole is the standard method in chemistry for communicating how much of a substance is present. A mole is the unit that measures the amount of a substance. One mole of 'something' contains 6.022 x 1023 entities. For example, in one mole of a chemical compound there are 6.022 x 1023 molecules. Let us calculate the molecular weight of some common compounds. Use the table below to find the atomic weight of each atom (element), or refer to a Periodic Table of the Elements. Hint: Count the number of atoms of each element, and then multiply that number by the element's atomic weight.
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