By Linda Williams
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The coefficients in chemical reactions tell you about the reactants and products in terms of moles, so most of the stoichiometry questions you’ll see on the test will be exercises in converting between moles and grams, liters, molarities, and other units. Moles and Molecules The definition of Avogadro’s number gives you the information you need to convert between moles and individual molecules and atoms. 022 × 1023 molecules Moles = Moles and Grams Moles and grams can be related by using the atomic weights given in the periodic table.
Atomic weights on the periodic table are given in terms of atomic mass units (amu), but an amu is the same as a gram per mole, so if 1 carbon atom weighs 12 amu, then 1 mole of carbon atoms weighs 12 grams. You can use the relationship between amu and g/mol to convert between grams and moles by using the following equation: Moles = Moles and Gases We’ll talk more about the ideal gas equation in Chapter 4, but for now, you should know that you can use it to calculate the number of moles of a gas if you know some of the gas’s physical properties.