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3 c a GO cvg.cengagenow.com/ilrn/takeAssignment/takeC a o e Save and Exi Study Submit Quiz OPrevious Page 10 of 12 Next O The heat of combustion of benzoic acid (CHscooH)is -3226 mol. When 0.900 g of benzoic acid was bumed in a bomb calorimeter the temperature of the calorimeter (including its contents) rose from 20.75 c to 25.57 "C What is the heat capacity (calorimeter constant) of the calorimeter? 0 A 669 kJ C B. 23.8 C o C. 0.513 C o D. 4.93 kurC E 115 C 13:07 Big Sean Sellin Dreams Ft Chris Brown (Pr. 1751 items, 5.2

Explanation / Answer

mass of benzoic acid = 0.900 g

molar mass of benzoic acid (C6H5COOH) = 7*12+2*16+6*1 = 122 g/mol

number of mol of benzoic acid,

n = mass / molar mass

= 0.900 g / 122 g/mol

= 7.377*10^-3 mol

so,

heat released = |heat on combustion| * number of mol

= 3226 KJ/mol * 7.377*10^-3 mol

= 23.8 KJ

This heat released is absorbed by calorimeter

so, Q for calorimeter = 23.8 KJ

use:

Q = C*(Tf - Ti)

23.8 KJ = C * (25.57 - 20.75) oC

C = 4.93 KJ/oC

Answer: 4.93 KJ/oC

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