Chapter 5 Review

# How many grams of water can be heated from 200 o c to

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19. How many grams of water can be heated from 20.0 o C to 25.0 o C by the addition of 324 J of energy? a. 15.5 b. 20.9 c. 1.36 x 10 3 d. 6.78 x 10 3 e. 387 20. The specific heat of bromine liquid is 0.226 J/g-K. What is the molar heat capacity (in J/mol-K) of bromine liquid? 21. The heat of solution ( H solution ) of sodium hydroxide is 44.4 kJ/mol. If a 13.9-g sample of NaOH dissolves in 250 g of water at 23.0 o C, what will be the final temperature of the solution? (Assume that the solution has the same specific heat as water.) 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)?

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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) 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) 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)

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