What is the value of capital deltaH when ten moles of calcium chloride dissolve in water?

Calculation of ΔH for Calcium Chloride Dissolution

The value of ΔH when ten moles of calcium chloride dissolve in water is -820 kJ, indicating that the reaction is exothermic.

Explanation:

The molar heat of solution (ΔHsoln) for calcium chloride is given as -82.8 kJ/mol. To find the total enthalpy change when ten moles of calcium chloride dissolve in water, you simply multiply the molar heat of solution by the number of moles. Here is the calculation:

ΔH = (-82.8 kJ/mol) × (10 mol) = -828 kJ

Therefore, the correct answer to the student's question is b) ΔH = -820 kJ.

This process is exothermic, meaning heat is released when calcium chloride dissolves in water, which is why the value for ΔH is negative.