Identify number of moles of donor atoms in $2 \mathrm{n}$ mole of $\mathrm{SCN}^{-}$.
Identify number of moles of donor atoms in $2 \mathrm{n}$ mole of $\mathrm{SCN}^{-}$.
3n
6n
4n
n
Solution
$\mathrm{SCN}^{-}$has two donor atoms nitrogen and sulfur either of which links to metal atom/ion when in forms a coordinate bond. Therefore, 1 mole of $\mathrm{SCN}^{-}$will have 2 moles of donor atoms.
Hence, $2 \mathrm{n}$ moles of $\mathrm{SCN}^{-}$will have $4 \mathrm{n}$ moles of donor atoms.