0.050 mol of sodium hydrogencarbonate was added to \( 50 \, cm^3 \) of \( 2.0 \, mol \, dm^{-3} \) solution of citric acid.
\( C_6H_8O_7(aq) + 3NaHCO_3(s) \rightarrow C_6H_5O_7Na_3(aq) + 3CO_2(g) + 3H_2O(l) \)
The initial temperature of the solution was 298K and the final temperature was 297K. What is the enthalpy of this reaction in \( kJ \, mol^{-1} \)? (\( c_w = 4.18 \, J \, g^{-1}K^{-1} \), \( Q = mc\Delta T \))