A gram of salt added to pure (distilled) water introduces around $2 \times 10^{22}$ ions?
Using dimensional analysis, we get

$$\frac{1 \ \text{g}}{58.44 \ \text{g mol$^{-1}$}} = 0.017 \ \text{mol}$$

$$(0.017 \ \text{mol})(6.022 \times 10^{23} \ \text{mol$^{-1}$}) = 1.02 \times 10^{22}$$