Calculate the enthalpy change for the given reaction from data provided (kJ/mole)

$\underset{\text{ Weak acid }\}}{\mathrm{HA}\left(g\right)}+\underset{\left(\text{ Weak base }\right\}}{\mathrm{B}\left(g\right)}⟶\mathrm{AHB}\left(s\right)$

$\mathrm{\Delta }{H}_{\text{neutralization }}\left\{\mathrm{HA}\right(aq)\text{ [at infinite dilution] }/B(aq)$ [at infinite dilution]} $=-40\mathrm{kJ}/\mathrm{mole}$

$\mathrm{\Delta }{H}_{\text{solution }}\left[\mathrm{HA}\right(g\left)\right]=-10\mathrm{kJ}/\mathrm{mole}$ {at infinite dilution}

$\mathrm{\Delta }{H}_{\text{solution }}\left[\mathrm{B}\right(g\left)\right]=-5\mathrm{kJ}/\mathrm{mole}$ {at infinite dilution}

$\mathrm{\Delta }{H}_{\text{solution }}\left[\mathrm{HAB}\right(\mathrm{s}\left)\right]=+8\mathrm{kJ}/\mathrm{mole}$  {at infinite dilution}