Given data,
Volume of lead.
[tex]V=12cm^3[/tex]Density of lead.
[tex]\text{Density}=11.3g/cm^3[/tex]Consider the formula of density.
[tex]\text{Density}=\frac{mass}{\text{volume}}[/tex]Rearrange the formula.
[tex]\text{mass}=\text{Density}\times volume[/tex]Substitute the given values.
[tex]\begin{gathered} \text{mass}=(11.3g/cm^3)\times(12cm^3) \\ \text{mass}=135.6\text{ }g \end{gathered}[/tex]Therefore, the mass of the lead is
[tex]\text{mass}=135.6\text{ g}[/tex]