What is the mass of ONE water molecule?
Answer:
Pretty small………..
Explanation:
You know that one mole of water, i.e. \(N_{A}\) water molecules, has a mass of \(18.01 \cdot g.\) And thus to get the mass of ONE water molelcule, we divide this molar mass by \(N_{A}=6.022 \times 10^{23}\)
And so mass of one water molecule \(=\frac{18.01 \cdot g \cdot m o l^{-1}}{6.022 \times 10^{23} \cdot m o l^{-1}}=? ? g\)