Chapter 5 Review

# Assume that the solution has the same specific heat

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(Assume that the solution has the same specific heat as water.) a. 35.2 o C b. 14.0 o C c. 37.8 o C d. 37.0 o C e. 40.2 o C 22. The following reactions occur for the hypothetical element E: 2E(l) + O 2 (g) 2EO(g) H O = -333 kJ EO(g) + O 2 (g) EO 3 (s) H o = -196 kJ What is H O (kJ) for the reaction 2E(l) + 3O 2 (g) 2EO 3 (s)? a. -526 b. +526 c. +725 d. -725

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e. -137 23. Consider the following thermochemical equations: Fe 2 O 3 + 3CO 2Fe + 3CO 2 H o = -28.0 kJ 3Fe + 4CO 2 4CO + Fe 3 O 4 H o = +12.5 kJ Calculate the value of H o (in kJ) for: 3Fe 2 O 3 + CO CO 2 + 2Fe 3 O 4 a. -59.0 b. 40.5 c. -15.5 d. -109 e. +109 24. Consider the following reactions: N 2 (g) + 2O 2 (g) 2NO 2 (g) H o = 66.4 kJ 2NO(g) + O 2 (g) 2NO 2 (g) H o = -114.2 kJ What is the value of H o (in kJ) for: N 2 (g) + O 2 (g) 2NO(g) a. 180.6 b. -47.8 c. 47.8 d. 90.3 e. -180.6 25. Substance H o f (kJ/mol) H 2 O(l) -286 NO(g) 90 NO 2 (g) 34 HNO 3 (aq) -207 NH 3 (g) -46 Calculate H o rxn (in kJ) for the reaction: 4NH 3 (g) + 5O 2 (g) 4NO(g) + 6H 2 O(l) a. -1172 b. -150 c. -1540 d. -1892 e. The H o f of O 2 (g) is needed for the calculation. 26. Substance H o f (kJ/mol) IF(g) -95 IF 5 (g) -840 IF 7 (g) -941 Determine the value of H o rxn (in kJ) for the reaction: IF 7 (g) + I 2 (g) IF 5 (g) + 2IF(g) a. 69 kJ b. 311 kJ c. -1991 kJ d. -69 kJ e. The H o f of I 2 (g) is needed for the calculation.
27. Substance H o f (kJ/mol) C 2 H 4 (g) 52.3 C 2 H 5 OH(l) -277.7 CH 3 CO 2 H(l) -484.5 H 2 O(l) -285.8 The value of é H ø for the following reaction is -137.0 kJ. What is the value of H o f (in kJ/mol) for C 2 H 6 (g)? C 2 H 4 (g) + H 2 (g) C 2 H 6 (g) a. 189.3 b. -84.7 c. -189.3 d. 84.7 e. More information is needed. 28. Substance H o f (kJ/mol) Ag 2 O(s) -31.0 Ag 2 S(s) -32.6 H 2 S(g) -20.6 H 2 O(l) -286 Determine the value of H o (in kJ) for the reaction: 2Ag 2 S(s) + O 2 (g) 2Ag 2 O(s) + 2S(s) a. -1.6 b. 1.6 c. -3.2 d. 3.2 e. Insufficient data given. Answer the following questions from chapter 10- gas laws. 29. Of the following, _____ is characteristic of gases. a. Gases are highly compressible. b. There are relatively large distances between molecules. c.

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Assume that the solution has the same specific heat as...

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