Reacting 0.0500 mol of HCl with 0.0500 mol of NaOH produces 2.9 kJ of heat. What is the enthalpy change per mole of acid?

1. Heat was produced, so the heat for the reaction is negative: minus 2.9 kJ. 2. That amount of heat came from 0.0500 mol of HCl reacting. 3. Form the conversion factor: minus 2.9 kJ per 0.0500 mol HCl. 4. Multiply by 1 mol HCl to get the per-mole value. 5. Minus 2.9 divided by 0.0500 gives minus 58 kJ per mole. 6. Since the balanced equation shows 1 mol of HCl, the thermochemical equation carries minus 58 kJ. 7. Reporting plus 58 kJ would claim the neutralization absorbs heat, contradicting the temperature rise. _Source: OpenStax Chemistry (CC BY 4.0), Ch 5 "Thermochemistry", section 5.3 Enthalpy_