A sample of solid benzoic acid (C,H;COOH) that weighs 0.800 g is burned in an excess of oxygen to CO2(g) and H,O(€) in a constant-volume calorimeter at 25°C. The temperature increase is observed to be...

Extracted text: A sample of solid benzoic acid (C,H;COOH) that weighs 0.800 g is burned in an excess of oxygen to CO2(g) and H,O(€) in a constant-volume calorimeter at 25°C. The temperature increase is observed to be 2.15°C. The heat capacity of the calorimeter and its contents is known to be 9382 J K-1. (a) Write and balance the equation for the combustion of benzoic acid. (b) Calculate the standard change in internal energy (AU°) for the combustion of 1.000 mol benzoic acid to CO2(g) and H2O(€) at 25°C. (c) Calculate the standard enthalpy change (AH°) for the same reaction as in part (b). (d) Calculate the standard enthalpy of formation per mole of benzoic acid, using data for the standard enthalpies of formation of CO2(g) and H,O(€) from Appendix D.