21. For CaCl2, the absolute value of the enthalpy of hydration is larger than the lattice enthalpy. This means that for CaCl2 (A) the enthalpy of solution is exothermic. (B) the lattice enthalpy is negative. (C) the enthalpy of hydration is positive. (D) the entropy changes of solution is smaller than 0. (E) the solubility increases when the temperature increases.