MHT CET202522 Apr 2025Evening ShiftChemistryThermodynamics (C)Actual
Calculate the enthalpy of solution of potassium chloride if its _ L H =700 ~kJ ~mol ⁻¹ and _ hyd H =-680 ~kJ ~mol ⁻¹
Options
- A20 ~kJ ~mol ⁻¹
- B345 ~kJ ~mol ⁻¹
- C690 ~kJ ~mol ⁻¹
- D1380 ~kJ ~mol ⁻¹
Correct answer
A. 20 ~kJ ~mol ⁻¹
Step-by-step solution
The enthalpy of solution _ sol H for potassium chloride is related to its lattice enthalpy _ L H and enthalpy of hydration _ hyd H by the equation: _ sol H = _ L H + _ hyd H Substituting the given values _ L H = 700 kJ mol ⁻¹ and _ hyd H = -680 kJ mol ⁻¹ : _ sol H = 700 + (-680) = 20 kJ mol ⁻¹ Final answer: 20 kJ mol ⁻¹