Question

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11.) D 12.) C

11. If 325 g of water at 4.20°C absorbs 12.28 kJ of heat, what is the final temperature of the water? A. 4.21°C B. 4.80°C c. 9.00°C D . 13.2°CE . 2938°C 12. Naphthalene combustion can be used to calibrate the heat capacity of a bomb calorimeter. The heat of combustion of naphthalene is -40.1 kJ/g. When 0.8210 ao naphthalene was burned in a calorimeter containing 1000 g of water, a temperature ise of 4.2100 was observed. What is the heat capacity of the bomb calorimeter excluding the water? A. 32.9 kJ/C B. 7.80 kJ/°C C. 3.64 kJ/°C D. 1.67 kJ/C E . 15.3 kJ/°C

Answer 1

11)

Given:

Q = 12280 J

m = 325 g

C = 4.184 J/g.oC

Ti = 4.2 oC

use:

Q = m*C*(Tf-Ti)

12280.0 = 325.0*4.184*(Tf-4.2)

Tf -4.2 = 9.03 oC

Tf = 13.2 oC

Answer: D

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