Chemistry · Some Basic Concepts of Chemistry

What is the exact fixed numerical value assigned to the Avogadro constant (\( N_A \)) in the SI system to define the mole?

1. A
   \( 6.02214076 \times 10^{23} \text{ mol}^{-1} \)
2. B
   \( 6.02214076 \times 10^{20} \text{ mol}^{-1} \)
3. C
   \( 6.62607015 \times 10^{23} \text{ mol}^{-1} \)
4. D
   \( 1.380649 \times 10^{23} \text{ mol}^{-1} \)