Complete Table 8.1 by putting one tick (✓) in each row to show the sign of each kind of energy change under standard conditions.
Define the enthalpy change of hydration.
Table 8.2 sets out several energy changes that can be used in the questions that follow.
Use relevant data from Table 8.2 to work out the lattice energy, $\Delta H^{\circ}_{\text{latt}}$, of $\text{CaBr}_2(s)$. Drawing a labelled energy cycle may help. Show your working.
Use relevant data from Table 8.2 and your answer to (c)(i) to work out the standard enthalpy change of hydration, $\Delta H^{\circ}_{\text{hyd}}$, of $\text{Br}^-$. Drawing a labelled energy cycle may help. If you could not answer (c)(i), use $-2500\,\text{kJ mol}^{-1}$ as your value for $\Delta H^{\circ}_{\text{latt}}$ of $\text{CaBr}_2(s)$. This is not the correct value. Show your working.
The enthalpy change of hydration of the $\text{Br}^-$ ion is more negative than that of the $\text{I}^-$ ion. Explain why.