Chapter 7, Problem 123A

Interpretation Introduction

Interpretation:

The density of the liquid needs to be determined.

Concept introduction:

The formula of calculation of density is,

$\text{Density=}\frac{\text{Mass of sample}}{\text{Volume of sample}}$

The unit of density of $\text{g/mL}$.

Answer to Problem 123A

Density of the unknown liquid is $2.34\text{g}{\text{mL}}^{-1}$.

Explanation of Solution

Given that the mass of the cylinder containing 2ml liquid is 34.68 g and the mass of empty cylinder is 30.00 g. From this information, mass of the liquid can be calculated.

$\begin{array}{c}\text{Mass}\text{of}\text{sample=34}\text{.68}\text{g}-30.00\text{g}\\ \text{=4}\text{.68}\text{g}\end{array}$

Volume of the sample is $2\text{mL}$.

$\begin{array}{c}\text{Density=}\frac{4.68\text{g}}{2\text{mL}}\\ =2.34\text{g}{\text{mL}}^{-1}\end{array}$

Conclusion

Thus, the density of a liquid can be calculated using its and volume and it is 2.34 g/mL.