Question

For a $0.400M$ solution of cobalt (II) iodide, how many moles of iodide ions can be found in $0.200L$ of solution?

• A. $0.400mol$
• B. $0.0800mol$
• C. $0.160mol$
• D. $0.320mol$

Answer 1

Answer: (C)

$0.160mol$

For $1mole$ of Cobalt(II) Iodide it produce $2moles$ of iodine ions.

So, given that ${\text{Molarity}}_{Co{I}_2}=0.4M;$ ${\text{Volume}}_{Co{I}_2}=0.2L;$

So, no. of moles of $Co{I}_2=0.4\times 0.2=0.08moles$

So, no. of moles of iodine $=2\times 0.08=0.16moles$