B) -15.5 E) 40.5 12) Given the data in the table below, AH°rxn for the reaction C) -109 12) D D) –59.0 3NO2 (g) + H2O (I) – 2HNO3 (aq) + NO (g) is kJ. Substance AH°f (kJ/mol) H2O (1) -286 NO (g) NO2 (g) 90 34 HNO3 (aq) -207 NH3 (g) -46 A) 140 E) -508 B) 64 C) -64 D) -140 13) B dupie of calcium carbonate [CaCOa (slabsorbs 40.3 I of heat, upon which the temperature of the e sample increases from 20.8 °C to 27.3 °C. If the specific heat of calcium carbonate is 0.82 J/g-K, what is the mass (in grams) of the sample? A) 5.1 g E) 5.3 g B) 7.6 g C) -7.6 g D) 0.13 g 14) D nic temperature of a 35.1 g sample of iron increases from 24.5 °C to 31.8 °C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed? A) 0.722 J E) 3.29 J B) 0.0936 J C) -115 J D) 115 J SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 15) 455S 15) The AHrxn for the combustion of methane is -890.0 kJ. How much heat energy (kJ) is released if 82.1 grams of methane are burned in an excess amount of oxygen? 3 VOodward Stoltzfus • Michael W. Lufaso

B) -15.5 E) 40.5 12) Given the data in the table below, AH°rxn for the reaction C) -109 12) D D) –59.0 3NO2 (g) + H2O (I) – 2HNO3 (aq) + NO (g) is kJ. Substance AH°f (kJ/mol) H2O (1) -286 NO (g) NO2 (g) 90 34 HNO3 (aq) -207 NH3 (g) -46 A) 140 E) -508 B) 64 C) -64 D) -140 13) B dupie of calcium carbonate [CaCOa (slabsorbs 40.3 I of heat, upon which the temperature of the e sample increases from 20.8 °C to 27.3 °C. If the specific heat of calcium carbonate is 0.82 J/g-K, what is the mass (in grams) of the sample? A) 5.1 g E) 5.3 g B) 7.6 g C) -7.6 g D) 0.13 g 14) D nic temperature of a 35.1 g sample of iron increases from 24.5 °C to 31.8 °C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed? A) 0.722 J E) 3.29 J B) 0.0936 J C) -115 J D) 115 J SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 15) 455S 15) The AHrxn for the combustion of methane is -890.0 kJ. How much heat energy (kJ) is released if 82.1 grams of methane are burned in an excess amount of oxygen? 3 VOodward Stoltzfus • Michael W. Lufaso

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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