1 mole=6.02×1023 ions1\text{ mole} = 6.02 \times 10^{23}\text{ ions}1 mole=6.02×1023 ions
0.02 mol dm−3=0.02×6.02×10230.02\,\mathrm{mol\,dm}^{-3} = 0.02 \times 6.02 \times 10^{23}0.02moldm−3=0.02×6.02×1023
=0.1204×1023=1.204×10220.1204 \times 10^{23} = 1.204 \times 10^{22}0.1204×1023=1.204×1022
≈eq 1.2×1022\approx\text{eq}\,1.2 \times 10^{22}≈eq1.2×1022
