A-LevelChemistryChemical energetics9701/12 · Feb/Mar 2025 · Q121 Mark
A student mixes 25.0 cm³ of 0.100 mol dm⁻³ sodium hydroxide solution with 25.0 cm³ of 0.100 mol dm⁻³ hydrochloric acid and the student records a temperature rise of 2.50 °C. What is the enthalpy change of the reaction per mole of NaOH?
A−209 kJ mol⁻¹
B−104.5 kJ mol⁻¹
C−209 J mol⁻¹
D−522.5 J mol⁻¹
✓ Correct answer
A: −209 kJ mol⁻¹
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