Which formula can be used to calculate the enthalpy of solution?

ΔH of solution = ΔH₁ + ΔH₂ + ΔH₃

Explanation:

Assume that the solution is formed via dissolving solute A in the molecules of Solvent B.

The formation of the solution goes through 3 steps:

1- The dissociation of the solute A particles, solute breaks apart the intermolecular forces holding the molecules together. It has ΔH₁ > 0 beause this is an endothermic process.

2- The dissociation of the solvent B particles, solute breaks apart the intermolecular forces holding the molecules together. It has ΔH₂ > 0 because this is an endothermic process.

3- The particles of the solvent and solute are holding together.  It has ΔH₃ < 0 because this is an exothermic process.

The enthalpy of the solution (ΔH of solution) will be equal to the sum of the enthalpy change of the three steps.ΔH of solution = ΔH₁ + ΔH₂ + ΔH₃.

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Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.