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Practice_EXAM_II

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Unformatted text preview: ) + 2CO2(g) ∆H = ‐1452.8 kJ What is the value of ∆H for the reaction of 8H2O(l) + 4CO2(g) 4CH3OH (l) + 6O2 (g)? (a) +1458.2 (b) ‐1458.2 (c) 3.46 (d) ‐2905.6 (e) +2905.6 Hint: 11th ed. Application of rules in p.p. 242‐244 or see p. 265 End‐of‐Chapter Questions & Probems # 6.24; 10th ed. p.p. 241‐243; 9th ed. p. 236: Guidelines or p. 249: Examle 6.9: concepts to use in multiple or reversing equation.. 21. What is the heat absorbed (in kJ) when 250 grams of water is heated from 22oC to 98oC? The specific heat of water is 4.18 J/g.K (or 4.18 J/g. oC) (a) 79 (b) 88 (c) 97 (d) 102 (e) 137 Hint: 11th ed. p.p.246‐247 Example 6.5; 10th ed. p.p. 245‐246 Example 6.5; 9th ed. p. 240: Example 6.5. 22. A sheet of gold weighing 10.0 g and at a temperature of 18.0oC is placed flat on a sheet of iron weighing 20.0 g and at a temperature of 55.6oC. What is the final temperature (oC) of the combined metals? Assume that no heat is lost to the surroundings. The specific heat of iron and gold are 0.444 and 0.129 J/g.oC, respectively. (Hint: the heat gained by the gold must be...
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