The Mole
chapter 10: the mole
What is the mole? Chemists use the mole to count atoms, molecules, ions, and formula units. It is important to note that a mole always contains the same number of particles. For example, you know that a dozen eggs will always contain 12 eggs. Likewise, a mole will always contain 6.022 x 1023 particles. Although a mole of any substance is the same number, different substances have different molar masses. The molar mass of a compound can be calculated from its chemical formula and can be used to convert from mass to moles of that compound. A molecular formula of a compound is a whole-number multiple of its empirical formula, where each coefficient in front of a reactant or product represent one mole of that substances. Hydrates are solid ionic compounds in which water molecules are trapped.
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