Question

convert to moles: 458166 atoms of H20

Answer 1

convert to moles: 458166 atoms of H20

if 458166 is number of molecules H2O $\nu = 7.6 \times 10^{-19} \text{ mol}$

$$\nu = \frac{N}{N_A}$$ $$\nu = \frac{458166}{602000 \times 10^{18}} = 7.6 \times 10^{-19} \text{ mol}$$

if 458166 is number of H+H+O atoms $\rightarrow$ number of molecules = 458166/3 = 152722$\rightarrow\nu = 2.5 \times 10^{-19} \text{ mol}$

$$\nu = \frac{N}{N_A}$$ $$\nu = \frac{152722}{602000 \times 10^{18}} = 2.5 \times 10^{-19} \text{ mol}$$