Hi Deepthi rajesh,
Molar mass of $\mathrm{H}_2 \mathrm{O}$
$$ \begin{aligned} & =2 \times 1+16=18 \mathrm{~g} / \mathrm{mol} \\ & \text { Mass }=\text { moles } \text { × } \text { molar mass } \\ & =1.2 \times 18 \end{aligned} $$
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