Chapter 7, Problem 7.23E

Calculate the molarity of the following solutions:

a. A sample of solid ${\text{Na}}_{\text{2}}{\text{SO}}_{\text{4}}$ weighing $0.140\text{g}$ is dissolved in enough water to make $10.\text{mL}$ of solution.

b. A $\text{4}\text{.50-g}$ sample of glucose $\left({\text{C}}_6{\text{H}}_{12}{\text{O}}_6\right)$ is dissolved in enough water to give $150.\text{mL}$ of solution.

c. A $\text{43}\text{.5-g}$ sample of ${\text{K}}_{\text{2}}{\text{SO}}_{\text{4}}$ is dissolved in a quantity of water, and the solution is stirred well. A $\text{25}\text{.0-mL}$ sample of the resulting solution is evaporated to dryness and leaves behind $2.18\text{g}$ of solid ${\text{K}}_{\text{2}}{\text{SO}}_{\text{4}}$.