(D) The molar mass of water $(H_2O)$ is $18 \ g/mol$.The number of moles $(n)$ is calculated as $n = \frac{\text{mass}}{\text{molar mass}} = \frac{180

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$6.023 \times 10^{24}$ molecules of water

(D) The molar mass of water $(H_2O)$ is $18 \ g/mol$.The number of moles $(n)$ is calculated as $n = \frac{\text{mass}}{\text{molar mass}} = \frac{180 \ g}{18 \ g/mol} = 10 \ moles$.The number of molecules is calculated as $n \times N_A = 10 \times 6.023 \times 10^{23} = 6.023 \times 10^{24}$ molecules.Therefore,the correct option is $D$.