Ch 3 ohg which choice below gives the correct signs

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) ® CH 3 OH(g). Which choice below gives the correct signs for both ∆ H ° and ∆ S ° ? H ° S ° (A) + + (B) + (C) + (D) (3 pts) 15. A student performing a calorimetry experiment combined 100.0 mL of 0.50 M HCl and 100.0 mL of 0.50 M NaOH in a Styrofoam cup calorimeter. Both solutions were initially at 20.0 ° C, but when the two were mixed the temperature rose to 23.2 ° C. Is D H ° for the neutralization reaction between HCl and NaOH positive, negative, or zero? (A) positive (B) negative (C) zero (4 pts) 16. Suppose the experiment from #15 is repeated in the same calorimeter, but this time using 100 mL of 1.00 M HCl and 100.0 mL of 1.00 M NaOH. Will the D T observed be greater than, less than, or equal to that seen in the first experiment? (A) greater than (B) less than (C) equal to (6 pts) 17. Given the following data, N 2 (g) + O 2 (g) ® 2 NO(g) H ° = +181 kJ 2 NO(g) + O 2 (g) ® 2 NO 2 (g) H ° = –113 kJ 2 N 2 O(g) ® 2 N 2 (g) + O 2 (g) H ° = –163 kJ calculate D H ° for the reaction below. N 2 O(g) + NO 2 (g) ® 3NO(g) (A) 131 kJ (B) 65.5 kJ (C) –95 kJ (D) –78 kJ (E) 156 kJ
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A6 © 2018 L.S. Brown (15 pts) 18. Identify each of the following Lewis structures as correct or incorrect, and circle “correct” or “incorrect” under the structure. For each incorrect structure, draw the actual structure for the same molecule in the box provided. All of these are intended to be for neutral molecules (not ions), and the sequence of atoms for each is correct in the structure shown. At least one structure is correct, and at least one is incorrect. (Graded as 5 pts each. For the 2 you had to draw, that was 2 for saying “incorrect” and then 3 for the structure.) (a). NOF correct or incorrect (b). C 2 H 2 correct or incorrect (c). HCN correct or incorrect F N O H C C H C N H F N O H C C H
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NAME:_________________________________ © 2018 L.S. Brown A7 19. Consider the complete combustion of octane, and use the thermodynamic data given as needed. 2 C 8 H 18 ( ! ) + 25 O 2 (g) ® 16 CO 2 (g) + 18 H 2 O( ! ) D H ° = –10,939.8 kJ Compound D H f ° (kJ/mol) S ° (J/K/mol) C 8 H 18 ( !
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  • Fall '07
  • GENERALCHEMFORENG
  • Chemistry, pts, Dr. Larry Brown, L.S. Brown

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