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1. When a 6.50 g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee- cup calorimeter, the temperature rises from 21.6 °C to 37.8 °C. Calculate AH (in kJ/mol NaOH) for the solution process NAOH(s) Na*(aq) + OH¯(aq) -> Assume that the specific heat of the solution is the same as that of pure water.

1. When a 6.50 g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee- cup calorimeter, the temperature rises from 21.6 °C to 37.8 °C. Calculate AH (in kJ/mol NaOH) for the solution process NAOH(s) Na*(aq) + OH¯(aq) -> Assume that the specific heat of the solution is the same as that of pure water.

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.62QE: A 50-mL solution of a dilute AgNO3 solution is added to 100 mL of a base solution in a coffee-cup...
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Thermodynamics PROBLEM SOLVING
1. When a 6.50 g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee- cup calorimeter, the temperature rises from 21.6 °C to 37.8 °C. Calculate AH (in kJ/mol NaOH) for the solution process NaOH(s) Na*(aq) + OH (ад) - Assume that the specific heat of the solution is the same as that of pure water. 2. A 7.35 g sample of quinone (C6H4O2) is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/°C. The temperature of the calorimeter increases from 18.75 °C to 39.67 °C. What is the heat of combustion per gram of quinone? Per mole of quinone? 3. From the enthalpies of reaction H2(8) + F2(g) 2 HF(g) AH = -537 kJ C(s) + 2 F2(8) 2 C(s) + 2 H2(g) calculate AH for the reaction of ethylene with F2: CF4(8) AH = -680 kJ CH4(8) AH = +52.3 kJ > C2H4(g) + 6 F2(8) 2 CF4(8) + 4 HF(g) > 4. Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) and Ca(OH)2. From the following enthalpy of reaction data and data in Appendix C, calculate AH;° for CaC2(s): CaC2(s) + 2 H2O(I) Ca(OH)2(s) + C2H>(g) AH° = -127.2 kJ 5. Calculate AS° values for the following reactions by using tabulated S° values from Appendix C. In each case explain the sign of ASº. (a) HNO3(g) + NH3(g) (b) 2 Fe¿O3(s) - (c) CaCO3(s,calcite) + 2HCI(g) NHẠNO3(s) 4 Fe(s) + 3 O2(g) - CaCl2(s) + CO2(8) + H2O(1) CGH6(1) + 6 H2(g) (d) 3 C2H6(g)
Transcribed Image Text:1. When a 6.50 g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee- cup calorimeter, the temperature rises from 21.6 °C to 37.8 °C. Calculate AH (in kJ/mol NaOH) for the solution process NaOH(s) Na*(aq) + OH (ад) - Assume that the specific heat of the solution is the same as that of pure water. 2. A 7.35 g sample of quinone (C6H4O2) is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/°C. The temperature of the calorimeter increases from 18.75 °C to 39.67 °C. What is the heat of combustion per gram of quinone? Per mole of quinone? 3. From the enthalpies of reaction H2(8) + F2(g) 2 HF(g) AH = -537 kJ C(s) + 2 F2(8) 2 C(s) + 2 H2(g) calculate AH for the reaction of ethylene with F2: CF4(8) AH = -680 kJ CH4(8) AH = +52.3 kJ > C2H4(g) + 6 F2(8) 2 CF4(8) + 4 HF(g) > 4. Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) and Ca(OH)2. From the following enthalpy of reaction data and data in Appendix C, calculate AH;° for CaC2(s): CaC2(s) + 2 H2O(I) Ca(OH)2(s) + C2H>(g) AH° = -127.2 kJ 5. Calculate AS° values for the following reactions by using tabulated S° values from Appendix C. In each case explain the sign of ASº. (a) HNO3(g) + NH3(g) (b) 2 Fe¿O3(s) - (c) CaCO3(s,calcite) + 2HCI(g) NHẠNO3(s) 4 Fe(s) + 3 O2(g) - CaCl2(s) + CO2(8) + H2O(1) CGH6(1) + 6 H2(g) (d) 3 C2H6(g)
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