The mass of the moon is $7.34\times {10}^{22}\mathrm{Kg}$ and the radius is $1.74\times {10}^6\mathrm{m}$. The gravitational field strength at its surface is

$\begin{array}{l}\mathrm{m}=7.34\times {10}^{22}\mathrm{Kg}\\ \mathrm{r}=1.74\times {10}^6\mathrm{m}\\ \mathrm{G}=6.675\times {10}^{-11}{\mathrm{Nm}}^2{\mathrm{Kg}}^{-2}\\ \mathrm{I}=\frac{\mathrm{GM}}{{\mathrm{r}}^2}=\frac{6.675\times {10}^{-11}\times 7.34\times {10}^{22}}{{\left(1.74\times {10}^6\right)}^2}\\ =\frac{48.9945\times {10}^{11}}{3.0276\times {10}^{12}}=16.18\times {10}^{-1}\\ =1.618\mathrm{N}/\mathrm{kg}\\ =1.62\mathrm{N}/\mathrm{kg}\end{array}$