Question

(1) (3 points ) A 1.21 g sample of benzoic acid, C7H602, is combusted in a bomb calorimeter in an oxygen rich environment. The calorimeter has a heat capacity of 1365 J/°C, and additionally contains 1.30 kg of water surrounding the bomb. The heat of combustion for benzoic acid is AH° = -3227 kJ per mole of benzoic acid. The initial temperature of the calorimeter and water is 22.5 °C. a. (1 point) What is the balanced chemical reaction that occurs inside the bomb calorimeter (include phases!)? b. (2 points) What is the final temperature of the water after the reaction is performed?

Answer 1

9 combustion of benzoic acid in bomb Calorimeter C1 kg 02 (3) t-s0, (8) > 1co, I9) +3H2O (8) benzoic acid Heaticombustion for benzoic acid = AM = -3227 kJ mo) given weight of benzoic aced = 1.219 molar mang benzoic acid = 122.12 9 mol y benzoic acid = given man Molar man mo = 1.219 122.12gnol -0.00991 mal

Heat capacity g Calorimeter = 1365 11°C initial Temprature of calorimeter = 20.5c man of water = 1-30kg Specific heat capacity g water = 4.184 Je

9 combustion = mic.OT heat absorted) = q = m.c.AT realed me man g substance Co specific heat capacity g substance DT= Chenge in Temprature ( Tinal Temp. - Ininal Temp.) Heat of combustion by 0.00991 mol of benzoic acid = -0.00191 metx 3227 KI mot 2-3).98 KJ KI= 1000 J 31.98 K3 = 31980I 80 Heat reabed = -31980 I -q reachin = heat absorbed by calorimeter + heat absorbed by water +31980J = Moe CleverinleX OT. + mwear X Cwatu XAT +319601 - 3468 1365 7° x 07 + 13008 487. XOT + 319603 - 07( 13653° + 5439.2 7). +31980J = ATX 680462 +31980 Y - OT 6804-27°C -4.7°C - OT

Change in Temp = +4.7°C AT= TE - Ti +467€ = Tf - 22.5°C 2702°c = Tt Answer Final Temprature of water = 27.2°C