# How many moles of water are in 0.34g of water?

$\text{Number of moles}$ $=$ $\text{Mass"/"Molar mass}$ $\cong$ $0.02 \cdot m o l$
And thus, $\frac{0.34 \cdot \cancel{g}}{18.01 \cdot \cancel{g} \cdot m o {l}^{-} 1}$ $=$ (??)/(mol^-1) $=$ ??mol