What would be the heat released when an aqueous solution containing 0.5 mole of HNO ₃ is mixed with 0.3 mole of OH ⁻ ? (enthalpy of neutralisation is -57.1 kJ )

Step-by-step solution

0.5 mole of HNO ₃ equivalents to 0.5 mole of H ⁺ . But only 0.3 mole of OH ⁻ ions are available. Thus, 0.3 mole of H ⁺ ions will combine with 0.3 mole of OH ⁻ ions to form 0.3 mole of H ₂ O and 0.2 mole of H ⁺ ions will remain unreacted. Heat evolved when 1 mole of H ⁺ ions combine with 1 mole of OH ⁻ ions =57.1 ~kJ . Therefore, heat evolved wher 0.3 mole of H ⁺ ions combine with 0.3 mole of OH ⁻ ions =0.3 57.1=17.13 ~kJ .