Question

How many hydrogen bonded water molecule (S) are associated in $CuS{O}_{4}5H_{2}O$

Answer 1

In $CuS{O}_4.5H_{2}O,Cu$ is coordinated with $4$ water molecules and two more oxygen atoms from Sulphate ion. Now $\text{fifth water molecule is hydrogen-bonded and is deeply embedded in a crystal. It is not coordinated.}$

$\text{thus, 4 water molecules are coordinated and the fifth is the only hydrogen bonded.}$