What is Avogadro's number? A 6.022 × 10²³ B 3.14 × 10⁸ C 9.81 × 10⁰ D 1.602 × 10⁻¹⁹ ✓ Correct Answer: Option A Avogadro's number (6.022 × 10²³) is the number of atoms/molecules in one mole of a substance. Practice ACT Exam Prep Quizzes → Browse All Questions Study Flashcards