Calculate the enthalpy change (ΔH) for a reaction given temperature changes, quantities of reactants and mass of water. (Formula: ΔH = H(products) – H(reactants))

A student dissolves \(4.20\) g of solid lithium bromide (\(\text{LiBr}\)) in \(150.0\) g of water in a polystyrene calorimeter. The temperature of the water increases from \(21.5\,^{\circ}\text{C}\) to \(26.8\,^{\circ}\text{C}\). Calculate the enthalpy change of solution, \(\Delta H_{\text{soln}}\), in \(\text{kJ mol}^{-1}\). Show your working.