Using the thermodynamic data provided below, the calculated Ksp for ZnS(s) at 25°C is:
a) 1.8 × 10⁻²⁵
b) 3.2 × 10⁻¹⁹
c) 5.2 × 10⁻²²
d) 7.5 × 10⁻²⁷