Question

If the reaction is

A(aq) + B(aq) → AB(aq)

and the molarity of A in solution A is 0.60 M and the molarity of B in solution B is M, calculate the enthalpy of reaction ΔHᵣₓₙ, for the formation of 1 mole of AB in solution

Answer 1

The enthalpy of reaction (\(\Delta H_{rxn}\)) is calculated using the specific heat change and amount of reactant, but the student's question lacks the heat change data (Q) to calculate it for their reaction.

Step-by-step explanation:

To calculate the enthalpy of reaction (\(\Delta H_{rxn}\)) for the formation of 1 mole of AB in solution, given the reaction A(aq) + B(aq) \(\rightarrow\) AB(aq), we need the specific heat Q for the reaction and the amount of A used (since A is provided in stoichiometric amounts). Using the provided example calculation where 0.0500 mol of HCl reacted and released -2.9 kJ of heat, the molar enthalpy change is calculated as follows:

\(\Delta H = \left( -2.9 \text{ kJ} \right) \times \left( \frac{1 \text{ mol}}{0.0500 \text{ mol HCl}} \right) = -58 \text{ kJ/mol} \)

Analogously, one would apply the same calculation method to the student's problem, provided that they have Q (the heat change) for their specific reaction.

Note: Since the question does not provide a specific heat change for the formation of AB, we cannot calculate an actual \(\Delta H_{rxn}\) value without additional information.