The lattice energy required to separate the ions in a hypothetical salt is

CHEMISTRY · Single correct · AP · Chemistry · Compound Structure and Properties · Compound Structure and Properties

Problem

The lattice energy required to separate the ions in a hypothetical salt

XCl_2

+2520\,\text{kJ mol}^{-1}

, and the hydration enthalpy for the ions once they are dispersed in water is

-2440\,\text{kJ mol}^{-1}

. What is the enthalpy change for the overall dissolution process,

\Delta H_{\text{soln}}

, for one mole of

XCl_2

? (a)

-80\,\text{kJ mol}^{-1}

(b)

+4960\,\text{kJ mol}^{-1}

(c)

+80\,\text{kJ mol}^{-1}

(d)

-2360\,\text{kJ mol}^{-1}