(C) The molar mass of water $(H_2O)$ is calculated as: $M = (2 \times 1.008 \ g/mol) + (1 \times 16.00 \ g/mol) = 18.016 \ g/mol \approx 18 \ g/mol$.

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(C) The molar mass of water $(H_2O)$ is calculated as: $M = (2 \times 1.008 \ g/mol) + (1 \times 16.00 \ g/mol) = 18.016 \ g/mol \approx 18 \ g/mol$. To find the mass,we use the formula: $\text{Mass} = \text{moles} \times \text{molar mass}$. $\text{Mass} = 0.25 \ mol \times 18 \ g/mol = 4.5 \ g$. Therefore,the correct option is $C$.