Chemistry - Mole Concept Question with Solution | TestHub

$\begin{array}{rl}& \text{Explanation: Density }=\frac{\text{ Mass }}{\text{ Volume }}\\ & \text{Density }=2.15\mathrm{g}/\mathrm{mL}\text{, Volume of solution }=2.5\mathrm{mL}\\ & \therefore 2.15=\frac{\text{ Mass }}{2.5}\Rightarrow \text{ Mass }=5.375\mathrm{g}\end{array}$ The correct significant figure should have the same number of significant digits as the number with least number of significant digits. $\therefore \text{ Mass }=5.4\mathrm{g}$