Question

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I TUR Check my work Enter your answer in the provided box. High-purity benzoic acid (C H2COOH; AH run for combustion = -3227 kJ/mol) is used as a standard for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter (heat capacity = 1365 J°C) that contains exactly 1.380 kg of water. What temperature change is observed? °C

Answer 1

Q = mcAT Q = heat capacity XAT Qbenzoic acid - Qwater + Q calorimeler AH = qn n = no. of males = mass/ molar mass AHA 12219 122:1291mol = 0.00 gg moles 0.01 mol q = AhXn | AH Xn - Cheat capacity) AT + (mass water (water AT 13227 kJ/mol to olmol = 1365 JOCAT -+ 13809 x 4:28 AT o Jlgec I 32. 27 kJ = 1365 Joc A T + 5 796 JOCAT 32.27 kJ = 7161 Joc AT AT = 32. 278 103 J 7161 J1 °C AT = 4.5°C