Complete Table 8.1 by placing a single tick ($\checkmark$) in each row to show the sign of every energy change under standard conditions.
Define the enthalpy change of hydration.
Choose and use the relevant information from Table 8.2 to determine the lattice energy, $\Delta H^{\circ}_{\text{latt}}$, of $\text{CaBr}_2(s)$. A labelled energy cycle may help. Show your working.
Use data from Table 8.2 together with your answer to (c)(i) to work out the standard enthalpy change of hydration, $\Delta H^{\circ}_{\text{hyd}}$, of $\text{Br}^-$. A labelled energy cycle may help. If you could not do (c)(i), take $-2500\,\text{kJ mol}^{-1}$ as $\Delta H^{\circ}_{\text{latt}}$ for $\text{CaBr}_2(s)$. Note that this is not the correct value. Show your working.
Explain why the enthalpy change of hydration of the $\text{Br}^-$ ion is more negative than that of the $\text{I}^-$ ion.