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2. The following reaction is by the reaction. 4A1 (s) + 302 (g) a) exothermic, released → 2A1203 (s) b) exothermic, absorbed c) endothermic, released d) endothermic, absorbed , and therefore heat is AH° = -3351 kJ

2. The following reaction is by the reaction. 4A1 (s) + 302 (g) a) exothermic, released → 2A1203 (s) b) exothermic, absorbed c) endothermic, released d) endothermic, absorbed , and therefore heat is AH° = -3351 kJ

Introductory Chemistry For Today
Introductory Chemistry For Today
8th Edition
ISBN:9781285644561
Author:Seager
Publisher:Seager
Chapter8: Reaction Rates And Equilibrium
Section: Chapter Questions
Problem 8.75E
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2. The following reaction is by the reaction. 4A1 (s) + 302 (g) a) exothermic, released → 2A1203 (s) b) exothermic, absorbed c) endothermic, released d) endothermic, absorbed and therefore heat is AH° = -3351 kJ
Transcribed Image Text:2. The following reaction is by the reaction. 4A1 (s) + 302 (g) a) exothermic, released → 2A1203 (s) b) exothermic, absorbed c) endothermic, released d) endothermic, absorbed and therefore heat is AH° = -3351 kJ
3. When 45 g of an alloy at 100°C is dropped into 100.0 g of water at 25°C, the final temperature is 37°C. What is the specific heat of the alloy (J/g°C)?).Specific heat of water is 4.186 J/g °C_ a)9.88 c) 0.423 4. The value for AH° for the reaction below is - 126kJ. How much heat (in kJ) is released when 2.00 mol of NaOH is formed in the reaction? 2Na2O2 (s) + 2H2₂0 (1)→ 4NaOH (s) + O2(g) a) 252 kJ b) 48.8 d) 1.77 c) 7.8 kJ d) 63 kJ 5. Solid A at 80°C is immersed in liquid B at 60°C. Which statement correctly describes the energy changes between A and B? b) - 126 kJ d) Both A and B release heat. a) A releases heat and B absorbs heat. b) A absorbs heat and B releases heat. c) Both A and B absorb heat.
Transcribed Image Text:3. When 45 g of an alloy at 100°C is dropped into 100.0 g of water at 25°C, the final temperature is 37°C. What is the specific heat of the alloy (J/g°C)?).Specific heat of water is 4.186 J/g °C_ a)9.88 c) 0.423 4. The value for AH° for the reaction below is - 126kJ. How much heat (in kJ) is released when 2.00 mol of NaOH is formed in the reaction? 2Na2O2 (s) + 2H2₂0 (1)→ 4NaOH (s) + O2(g) a) 252 kJ b) 48.8 d) 1.77 c) 7.8 kJ d) 63 kJ 5. Solid A at 80°C is immersed in liquid B at 60°C. Which statement correctly describes the energy changes between A and B? b) - 126 kJ d) Both A and B release heat. a) A releases heat and B absorbs heat. b) A absorbs heat and B releases heat. c) Both A and B absorb heat.
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