What is the value of Avogadro's number?
- A$6.022 \times 10^{23} \ mol^{-1}$
- B$6.626 \times 10^{-34} \ J \ s$
- C$1.602 \times 10^{-19} \ C$
- D$9.109 \times 10^{-31} \ kg$
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