John mixes 30 cm³ HCl with 30 cm³ NaOH. The temperature change is 6.0 °C. What is total energy released?

Which is most reactive based on energy released?

Which statement is true?

John adds 25 cm³ of 1.0 mol/dm³ HCl to 25 cm³ of 1.0 mol/dm³ NaOH in a polystyrene cup. The temperature rises from 25.0 °C to 31.0 °C.
What is the temperature change?

Why is a polystyrene cup used in calorimetry experiments?

Xinyi let 25 cm³ of 1.0 mol/dm³ HCl react with 25 cm³ of 1.0 mol/dm³ NaOH. She recorded the temperature rise = 6.5 °C.
Given water density is 1.0 g/cm³, find ΔH in kJ/mol.