## Chemistry: The Molecular Science (5th Edition)

$8.7 \times 10 ^{-18} m^2$
We convert to $m^2$. Remember that when there is a squared term or cubed term in the units, we need to adjust for that. For example, it we are converting from $mm^2$ to $m^2$, we need to multiply by $10^{-6},$ not $10^{-3}$. $8.7 \times 10 ^{-18} m^2$