The lattice energy of is 205 kJ/mol and the hydration energies of and ions are –80 and –40 kJ/mol, r — Thermodynamics and Thermochemistry Chemistry Question

Question

The lattice energy of $\text{Na}_2\text{CO}_3\text{(s)}$ is 205 kJ/mol and the hydration energies of $\text{Na}^+$ and $\text{CO}_3^{2-}$ ions are –80 and –40 kJ/mol, respectively. The correct prediction about the solubility of $\text{Na}_2\text{CO}_3$ in water is (Assume that $\Delta H$ is independent of temperature.)