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6.56 Is AH positive or negative when 1 mol of water vapor con- denses to liquid water? Why? How does this value compare with onor?

6.56 Is AH positive or negative when 1 mol of water vapor con- denses to liquid water? Why? How does this value compare with onor?

Chemistry
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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6.53 A chemical engineer burned 1.520 g of a hydrocarbon in the bomb of a calorimeter (see Figure 6.10). The water temperature rose from 20.00°C to 23.55°C. If the calorimeter had a heat capac- ity of 11.09 kJ/K, what was the heat released (qy) per gram of hydrocarbon? 6.6 the (a) 6.6 Stoichiometry of Thermochemical Equations (Sample Problem 6.8) ро na Concept Review Questions na is 6.54 Does a negative AH mean that the heat should be treated as a reactant or as a product? (b he 6.55 Would you expect O2(g) negative AH? Explain. 6.56 Is AH positive or negative when 1 mol of water vapor con- denses to liquid water? Why? How does this value compare with AH for the vaporization of 2 mol of liquid water to water vapor? 20(8) to have a positive or a 6. ar m is Skill-Building Exercises (grouped in similar pairs) (S 6.57 Consider the following balanced thermochemical equation for a reaction sometimes used for H,S production: S8(s) + H2(8) – H,S(g) AH = -20.2 kJ 6. (a) Is this an exothermic or endothermic reaction? (b) What is AH for the reverse reaction? (c) What is AH when 2.6 mol of Sg reacts? (d) What is AH when 25.0 g of Sg reacts? 6. 6.58 Consider the following balanced thermochemical equation for the decomposition of the mineral magnesite: MGCO3(s) – (a) Is heat absorbed or released in the reaction? (b) What is AH for the reverse reaction? (c) What is AH when 5.35 mol of CO2 reacts with excess MgO? (d) What is AH when 35.5 g of CO2 reacts with excess MgO? MgO(s) + CO2(g) AH=117.3 kJ >
Transcribed Image Text:6.53 A chemical engineer burned 1.520 g of a hydrocarbon in the bomb of a calorimeter (see Figure 6.10). The water temperature rose from 20.00°C to 23.55°C. If the calorimeter had a heat capac- ity of 11.09 kJ/K, what was the heat released (qy) per gram of hydrocarbon? 6.6 the (a) 6.6 Stoichiometry of Thermochemical Equations (Sample Problem 6.8) ро na Concept Review Questions na is 6.54 Does a negative AH mean that the heat should be treated as a reactant or as a product? (b he 6.55 Would you expect O2(g) negative AH? Explain. 6.56 Is AH positive or negative when 1 mol of water vapor con- denses to liquid water? Why? How does this value compare with AH for the vaporization of 2 mol of liquid water to water vapor? 20(8) to have a positive or a 6. ar m is Skill-Building Exercises (grouped in similar pairs) (S 6.57 Consider the following balanced thermochemical equation for a reaction sometimes used for H,S production: S8(s) + H2(8) – H,S(g) AH = -20.2 kJ 6. (a) Is this an exothermic or endothermic reaction? (b) What is AH for the reverse reaction? (c) What is AH when 2.6 mol of Sg reacts? (d) What is AH when 25.0 g of Sg reacts? 6. 6.58 Consider the following balanced thermochemical equation for the decomposition of the mineral magnesite: MGCO3(s) – (a) Is heat absorbed or released in the reaction? (b) What is AH for the reverse reaction? (c) What is AH when 5.35 mol of CO2 reacts with excess MgO? (d) What is AH when 35.5 g of CO2 reacts with excess MgO? MgO(s) + CO2(g) AH=117.3 kJ >
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