Advanced Placement (AP) Chemistry Practice Exam

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What is Avogadro's number?

3.014 x 10^23
6.022 x 10^22
6.022 x 10^23
1.204 x 10^24

The correct answer is: 6.022 x 10^23

Avogadro's number is defined as the number of atoms, molecules, or particles in one mole of a substance. This constant is fundamental in chemistry as it provides a bridge between the atomic scale and the macroscopic scale that we can measure. The precise value of Avogadro's number is approximately 6.022 x 10^23, making it essential for calculations involving moles and determining the number of entities in a given sample. This value allows chemists to relate quantities of substances to their corresponding number of molecules and enables stoichiometric calculations in chemical reactions. Recognizing this value and its application in converting between moles and number of particles is crucial for understanding concepts in chemistry, such as molarity and gas laws.