Chemistry · EQUILIBRIUM

At \( 298\text{ K} \), pure water has a density of \( 1000\text{ g/L} \) and molar mass of \( 18.0\text{ g/mol} \). If the concentration of \( \text{H}^+ \) ions is \( 1.0 \times 10^{-7}\text{ M} \), what is the fraction of water molecules that are dissociated into ions?

1. A
   \( 1.8 \times 10^{-9} \)
2. B
   \( 1.8 \times 10^{-7} \)
3. C
   \( 5.55 \times 10^{-8} \)
4. D
   \( 1.0 \times 10^{-14} \)