(A) The density of pure water is approximately $1000 \ g/L$. The molar mass of water $(H_2O)$ is $18 \ g/mol$. Molarity $(M)$ is defined as the number

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(A) The density of pure water is approximately $1000 \ g/L$. The molar mass of water $(H_2O)$ is $18 \ g/mol$. Molarity $(M)$ is defined as the number of moles of solute per liter of solution. Molarity of pure water $= \frac{\text{Density}}{\text{Molar mass}} = \frac{1000 \ g/L}{18 \ g/mol} \approx 55.6 \ M$. Therefore,the correct option is $A$.