(C) The molar mass of water $(H_2O)$ is $18 \ g/mol$. The number of moles is calculated using the formula: $\text{Moles} = \frac{\text{Given mass}}{\t

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(C) The molar mass of water $(H_2O)$ is $18 \ g/mol$. The number of moles is calculated using the formula: $\text{Moles} = \frac{\text{Given mass}}{\text{Molar mass}}$. $\text{Moles of water} = \frac{180 \ g}{18 \ g/mol} = 10 \ mol$. Therefore,the correct option is $(C)$.