18. For the following combustion reaction of benzoic acid (HC7H5O2; molar mass = 122.1 g/mol) HC;H5O2(s) + 15/202(g) 7CO2(g) + 3H20(1); DHcomb = -3226 kJ --> 1.00 g of benzoic acid is combusted in a bomb calorimeter, which contains 1.00 kg of water (specific heat = 4.184 J/g.°C) and the bomb has a heat capacity of 890 J/°C. If the initial temperature of the calorimeter is 25.0°C, what is the final temperature of the calorimeter when the combustion is completed? (A) 51.8°C (B) 31.3°C (C) 30.2°C (D) 27.0°C

18. For the following combustion reaction of benzoic acid (HC7H5O2; molar mass = 122.1 g/mol) HC;H5O2(s) + 15/202(g) 7CO2(g) + 3H20(1); DHcomb = -3226 kJ --> 1.00 g of benzoic acid is combusted in a bomb calorimeter, which contains 1.00 kg of water (specific heat = 4.184 J/g.°C) and the bomb has a heat capacity of 890 J/°C. If the initial temperature of the calorimeter is 25.0°C, what is the final temperature of the calorimeter when the combustion is completed? (A) 51.8°C (B) 31.3°C (C) 30.2°C (D) 27.0°C

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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N2(g) + O2(g)< -----> 2 NO(g) H = +180.7 kJ 2 H2O(l) <-----> 2 H2(g) + O2(g) H = +571.7 kJ 4 NH3(g) + 5 O2(g) <-----> 4 NO(g) + 6 H2O(l) H = -1167.1 kJ Use Hess's law to calculate H for the reaction below. 2 NH3(g) <-----> N2(g) + 3 H2(g)
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