chemistry quiz 6

chemistry quiz 6 - 1. (Points: 2.5) Calculate DfH for...

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1. (Points: 2.5) Calculate DfH° for sulfur dioxide given the thermochemical equations below. 2 S(s) + 3 O2(g) ® 2 SO3(g) DrH° = –791.5 kJ 2 SO2(g) + O2(g) ® 2 SO3(g) DrH° = –197.9 kJ 1. –593.6 kJ/mol 2. –989.4 kJ/mol 3. –395.7 kJ/mol 4. –296.8 kJ/mol 5. –494.7 kJ/mol Save Answer 2. (Points: 2.5) The standard molar enthalpy of formation of NH3(g) is –45.9 kJ/mol. What is the enthalpy change if 6.31 g N2(s) and 1.96 g H2(g) react to produce NH3(g)? 1. –10.3 kJ 2. –29.8 kJ 3. –20.7 kJ 4. –65.6 kJ 5. –43.7 kJ Save Answer 3. (Points: 2.5) Which of the following statements is/are CORRECT? 1. A system is defined as an object or collection of objects being studied. 2. Surroundings are defined as everything outside of the system being studied. 3. In an exothermic reaction, heat is transferred from the system to the surroundings. 1. 3 only 2. 1, 2, and 3 3. 1 and 3 4. 2 only 5. 1 only Save Answer 4. (Points: 2.5) 65.0 g of ice at –17.0 °C is mixed with 256 g of water at 29.2 °C. Calculate the final temperature of the mixture. Assume that no energy in the form of heat is transferred to the environment. (Heat of fusion = 333 J/g; specific heat capacities: ice = 2.06 J/g×K, liquid water = 4.184 J/g×K) 1. 19.8 °C 2. 21.6 °C 3. 5.5 °C 4. 0.0 °C 5. 6.1 °C
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Save Answer 5. (Points: 2.5) If 245 J is required to change the temperature of 14.4 g of chromium by 38.0 K, what is the specific heat capacity of chromium? 1. 4.18 J/g×K 2. 0.448 J/g×K 3. 2.23 J/g×K 4. 4.68 J/g×K 5. 92.8 J/g×K Save Answer http://bohr.winthrop.edu/faculty/hurlbert/link_to_webpages/courses/chem105/Grading/Test %202%20Key.pdf 6. (Points: 2.5)
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This note was uploaded on 03/10/2010 for the course CHM 151 taught by Professor Staff during the Spring '08 term at Pima CC.

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chemistry quiz 6 - 1. (Points: 2.5) Calculate DfH for...

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