A sample of cobalt(II) chloride hydrate is heated strongly until all water is removed

CHEMISTRY · Single correct · CBSE · Chemistry · Acids, Bases and Salts · Acids, Bases and Salts

Problem

6.25\,\text{g}

sample of cobalt(II) chloride hydrate is heated strongly until all water is removed, leaving

3.40\,\text{g}

of anhydrous CoCl

_2

. What is the empirical formula of the original hydrate? (a)

\text{CoCl}_2\cdot4\text{H}_2\text{O}

(b)

\text{CoCl}_2\cdot3\text{H}_2\text{O}

(c)

\text{CoCl}_2\cdot6\text{H}_2\text{O}

(d)

\text{CoCl}_2\cdot8\text{H}_2\text{O}