Which value represents Avogadro's number?

• A. 6.022×10^26
• B. 6.022×10^23
• C. 3.011×10^23
• D. 1.204×10^23

Answer: (B)

Avogadro's number is the number of particles in one mole of any substance, the bridge between the microscopic world of atoms and the macroscopic world of grams. It tells you how many atoms, molecules, or ions are in a mole, so you can convert between amount of substance and number of particles. The value that fits this constant is 6.022×10^23, meaning one mole contains about 6.022×10^23 particles. This is the standard count used to relate mass and quantity of substance, such as why one mole of carbon-12 weighs exactly 12 grams. The other numbers are off by factors of about a thousand or by roughly a factor of two, so they don’t match the established number of particles per mole.