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. 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 → 2 HF(g) AH = -537 kJ H2(8) + F2(g) C(s) + 2 F2(8) AH = -680 kJ CF4(g) CH4(g) calculate AH for the reaction of ethylene with F2: > 2 C(s) + 2 H2(8) AH = +52.3 kJ - C2H4(g) + 6 F2(g) 2 CF4(g) + 4 HF(8) 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 H,O(1) Ca(OH)2(s) + C,H½(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 AS°. (a) HNO3(g) + NH3(8) (b) 2 Fe¿O3(s) (c) CaCO;(s,calcite) + 2HCI(g) NH4NO3(s) 4 Fe(s) + 3 O2(g) - > CaCl2(s) + CO2(8) + H20(1) (d) 3 CaHde) → CH(/) + 6 Halg)
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. 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 → 2 HF(g) AH = -537 kJ H2(8) + F2(g) C(s) + 2 F2(8) AH = -680 kJ CF4(g) CH4(g) calculate AH for the reaction of ethylene with F2: > 2 C(s) + 2 H2(8) AH = +52.3 kJ - C2H4(g) + 6 F2(g) 2 CF4(g) + 4 HF(8) 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 H,O(1) Ca(OH)2(s) + C,H½(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 AS°. (a) HNO3(g) + NH3(8) (b) 2 Fe¿O3(s) (c) CaCO;(s,calcite) + 2HCI(g) NH4NO3(s) 4 Fe(s) + 3 O2(g) - > CaCl2(s) + CO2(8) + H20(1) (d) 3 CaHde) → CH(/) + 6 Halg)
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. 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 → 2 HF(g) AH = -537 kJ H2(8) + F2(g) C(s) + 2 F2(8) AH = -680 kJ CF4(g) CH4(g) calculate AH for the reaction of ethylene with F2: > 2 C(s) + 2 H2(8) AH = +52.3 kJ - C2H4(g) + 6 F2(g) 2 CF4(g) + 4 HF(8) 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 H,O(1) Ca(OH)2(s) + C,H½(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 AS°. (a) HNO3(g) + NH3(8) (b) 2 Fe¿O3(s) (c) CaCO;(s,calcite) + 2HCI(g) NH4NO3(s) 4 Fe(s) + 3 O2(g) - > CaCl2(s) + CO2(8) + H20(1) (d) 3 CaHde) → CH(/) + 6 Halg)
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)
Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.
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