When 7.82 g of benzaldehyde, C₆H₅CHO, was burned in a bomb calorimeter at 298.15 K, the heat released was 259.2 kJ. Calculate the enthalpy of combustion of benzaldehyde at this temperature.

Question

Quizplus · Accepted Answer

The enthalpy of combustion is calculated by dividing the heat released by the number of moles of benzaldehyde. The molar mass of benzaldehyde is approximately 106.12 g/mol. Thus, 7.82 g corresponds to 0.0737 mol. The enthalpy of combustion is then 259.2 kJ / 0.0737 mol = -3520 kJ/mol.

When 782 G of Benzaldehyde, C6H5CHO, Was Burned in a Bomb

When 782 G of Benzaldehyde, C₆H₅CHO, Was Burned in a Bomb