Two solutions, 50.0 mL of 1.00 M BaCl₂(aq) and 50.0 mL of 1.00 M Na₂SO₄(aq), both initially at 21.5°C, are added to a calorimeter with a total heat capacity, after the solutions are added, of 1.10 kJ/°C and the temperature rises to 22.7°C. Determine qrxn per mole of BaSO₄(s) formed in the reaction.

Question

Quizplus · Accepted Answer

The heat absorbed by the calorimeter is q = CΔT = 1.10 kJ/°C * (22.7°C - 21.5°C) = 1.32 kJ. Since the reaction forms 0.050 moles of BaSO₄, qrxn per mole is -1.32 kJ / 0.050 mol = -26.4 kJ/mol.

Two Solutions, 50