A-LevelChemistryChemical energetics9701/12 · Feb/Mar 2017 · Q71 Mark
A student mixed 25.0 cm³ of 4.00 mol dm⁻³ hydrochloric acid with an equal volume of 4.00 mol dm⁻³ sodium hydroxide. The initial temperature of both solutions was 15.0°C. The maximum temperature recorded was 30.0°C. Using these results, what is the enthalpy change of neutralisation of hydrochloric acid?
A-62.7 kJ mol⁻¹
B-31.4 kJ mol⁻¹
C-15.7 kJ mol⁻¹
D-3.14 kJ mol⁻¹
✓ Correct answer
B: -31.4 kJ mol⁻¹
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