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### Course: Chemistry library>Unit 4

$\mathrm{K}{\phantom{A}}_{2}\mathrm{CO}{\phantom{A}}_{3}\left(aq\right)+\mathrm{CaCl}{\phantom{A}}_{2}\left(aq\right)\to 2\phantom{\rule{0.167em}{0ex}}\mathrm{KCl}\left(aq\right)+\mathrm{CaCO}{\phantom{A}}_{3}\left(s\right)$
A student conducts an experiment to determine the molarity of a $\mathrm{K}{\phantom{A}}_{2}\mathrm{CO}{\phantom{A}}_{3}\left(aq\right)$ solution of unknown concentration. The student mixes $100.\phantom{\rule{0.278em}{0ex}}\text{mL}$ of the solution with excess $\mathrm{CaCl}{\phantom{A}}_{2}\left(aq\right)$, causing $\mathrm{CaCO}{\phantom{A}}_{3}\left(s\right)$ to precipitate. The student then filters and dries the precipitate and records the data in the table below. (The molar mass of $\mathrm{CaCO}{\phantom{A}}_{3}$ is $100.\phantom{\rule{0.278em}{0ex}}\text{g/mol}$.)
Mass of filter paper + $\mathrm{CaCO}{\phantom{A}}_{3}$ precipitate
What is the molarity of the $\mathrm{K}{\phantom{A}}_{2}\mathrm{CO}{\phantom{A}}_{3}\left(aq\right)$ solution?