(D) Density of water $(d)$ is $1 \ g/mL$.Mass of $1 \ L$ $(1000 \ mL)$ of water is $1000 \ g$.Molar mass of water $(H_2O)$ is $18 \ g/mol$.Number of m

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(D) Density of water $(d)$ is $1 \ g/mL$.Mass of $1 \ L$ $(1000 \ mL)$ of water is $1000 \ g$.Molar mass of water $(H_2O)$ is $18 \ g/mol$.Number of moles of water = $\frac{\text{Mass}}{\text{Molar mass}} = \frac{1000 \ g}{18 \ g/mol} = 55.55 \, mol$.Number of molecules = $\text{Moles} \times N_A = 55.55 \, N_A$.