$1 \ mL$ of water has $25$ drops. Let $N_0$ be the Avogadro number. What is the number of molecules present in $1$ drop of water? (Density of water $= 1 \ g / mL$)
- A$\frac{0.02}{9} \ N_0$
- B$\frac{18}{25} \ N_0$
- C$\frac{25}{18} \ N_0$
- D$\frac{0.04}{25} \ N_0$
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