A student combines $25.0\,\text{cm}^3$ of $0.100\,\text{mol dm}^{-3}$ sodium hydroxide solution with $25.0\,\text{cm}^3$ of $0.100\,\text{mol dm}^{-3}$ hydrochloric acid, and the student measures a temperature increase of $2.50\,^{\circ}\text{C}$. What is the enthalpy change of the reaction per mole of NaOH?
- A$-209\,\text{kJ mol}^{-1}$
- B$-104.5\,\text{kJ mol}^{-1}$
- C$-209\,\text{J mol}^{-1}$
- D$-522.5\,\text{J mol}^{-1}$