What is Avogadro's number approximately equal to?

• A. 6.02 x 10^23
• B. 3.00 x 10^23
• C. 1.50 x 10^23
• D. 9.11 x 10^23

Answer: (A)

The key idea is that Avogadro’s number tells you how many particles are in one mole of any substance. One mole contains about 6.02 × 10^23 elementary entities, which is why this constant is used to bridge macroscopic amounts you can weigh with the microscopic world of atoms and molecules. This means that if you have one mole of something, you have roughly 6.02 × 10^23 particles of it, and the mass of that mole is its molar mass in grams.

That’s why 6.02 × 10^23 is the best choice here: it’s the standard approximate value for Avogadro’s number. The other figures don’t represent the number of particles in a mole, so they don’t match this concept.