When $N{H}_{2}D$ forms a crystal, each molecule can have three possible orientations because of the similarity of $H$ and $D($a special symbol given to ${?}^{2}H).$ Assuming $3\mathrm{.}0$ possible microstates for each $N{H}_{2}D$ molecule, calculate the value of $S,$ the molar entropy of the crystal, when one mole of it forms a crystalline solid at $0K.$

What is the free energy change of a reaction at $390K,$ given the enthalpy and entropy of reaction below.

$\backslash$table$[[H_{rn},-7\mathrm{.}5kJ*mo{l}^{-1}$