Question

Calculate the mass of 0.2 moles of water.

Answer 1

$$\begin{gathered} 1\mathrm{mole}\mathrm{of}{\mathrm{H}}_2\mathrm{O}=18\mathrm{g} \\ \mathrm{Therefore},0.2\mathrm{mole}\mathrm{of}{\mathrm{H}}_2\mathrm{O}=0.2\times 18=3.6\mathrm{g} \end{gathered}$$

Hence,the mass of 0.2 moles of water is 3.6g.