Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Q 6 please
1) Calculate the standard enthalpy of reaction for the combustion of methane: lo CO₂(g) + 2H₂O(g) →CH₂(g) +20₂(g), AH =?or 80-10 Given that: AH, (CH₂(g))= -75 KJ/mol, AH', (CO₂(g))= -394 KJ/mol, and AH, (H₂O(g))= -284 KJ/mol a) AH = -887 KJ/mol b) AH = +887 KJ/mol c) AH = -443.5 KJ/mol d) AH = 443.5 KJ/mol rz FAN 2) In the following figure, if AH₁ = 1000 KJ, AH3 = +1000 KJ, AH4 =-1000 KJ, calculate AH₂? a) AH-1000 KJ zorlu b) AH 1000 KJ c) AH₂= -3000 KJ d) AH₂=3000 KJ 3) A 300-g piece of iron at 70 °C is dropped into 266.4 mL of water at 24.0 °C. The final temperature of the water and iron was measured as 40 °C. Calculate the specific heat of the iron. Assume the specific heat of the water is 4.18 J/(g.°C)? a) S.Hiron = 2.97 J/(g.°C) b) S.Hiron = 2.55 J/(g.°C) c) S.Hiron 2.23 J/(g.°C) d) S.Hiron = 1.98 J/g °C) is zero (q=0)? c) Isobaric process 4) In which process, heat absorbed or released by a system a) Adiabatic process b) Isothermal process 5) Enthalpies of two reaction are given below; A+B →C+2D, AH,= - KJ/mol C+E →A+F, AH₂=+x KJ/mol Calculate AH for the reaction: 3A +2B+F→→3C+4D+E b) AH=2x + y a) AH=2% - Y c) AH=X+Y O Indicate which one of the following reactions result in a negative ASsys? a) H₂O(g) H₂O(s) c) CuSO4.(H₂O)s (s) CuSO4(s) + 5H₂O(g) ( According to 2nd law of thermodynamics, in a spontaneous a) the entropy of the system c) the energy of the universe D A- ΔΗ, AH, BAH, CAH₂ b) CaCO3(s) d) CO₂(aq) + CO₂(g) d) Isochoric process CaO(s) + CO₂(g) A reaction is at equilibrium at a given temperature and constant pressure when a) AGsys > 0 b) AGsys <0 c) AGsys=0 d) AH = -x - 2y process, which of the following always increases b) the enthalpy of the system d) the entropy of the universe d) AHsys >0 The enthalpy and entropy of vaporization of ethanol are 38.6 kJ/mol and 109.8 J/mol K, respectively. Wha is the boiling point of ethanol, in °C? No 1 batz a) 352 °CRETO.0 b) 78.5 °C 1 c) 2.84 °C d) 624 °C
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Transcribed Image Text:1) Calculate the standard enthalpy of reaction for the combustion of methane: lo CO₂(g) + 2H₂O(g) →CH₂(g) +20₂(g), AH =?or 80-10 Given that: AH, (CH₂(g))= -75 KJ/mol, AH', (CO₂(g))= -394 KJ/mol, and AH, (H₂O(g))= -284 KJ/mol a) AH = -887 KJ/mol b) AH = +887 KJ/mol c) AH = -443.5 KJ/mol d) AH = 443.5 KJ/mol rz FAN 2) In the following figure, if AH₁ = 1000 KJ, AH3 = +1000 KJ, AH4 =-1000 KJ, calculate AH₂? a) AH-1000 KJ zorlu b) AH 1000 KJ c) AH₂= -3000 KJ d) AH₂=3000 KJ 3) A 300-g piece of iron at 70 °C is dropped into 266.4 mL of water at 24.0 °C. The final temperature of the water and iron was measured as 40 °C. Calculate the specific heat of the iron. Assume the specific heat of the water is 4.18 J/(g.°C)? a) S.Hiron = 2.97 J/(g.°C) b) S.Hiron = 2.55 J/(g.°C) c) S.Hiron 2.23 J/(g.°C) d) S.Hiron = 1.98 J/g °C) is zero (q=0)? c) Isobaric process 4) In which process, heat absorbed or released by a system a) Adiabatic process b) Isothermal process 5) Enthalpies of two reaction are given below; A+B →C+2D, AH,= - KJ/mol C+E →A+F, AH₂=+x KJ/mol Calculate AH for the reaction: 3A +2B+F→→3C+4D+E b) AH=2x + y a) AH=2% - Y c) AH=X+Y O Indicate which one of the following reactions result in a negative ASsys? a) H₂O(g) H₂O(s) c) CuSO4.(H₂O)s (s) CuSO4(s) + 5H₂O(g) ( According to 2nd law of thermodynamics, in a spontaneous a) the entropy of the system c) the energy of the universe D A- ΔΗ, AH, BAH, CAH₂ b) CaCO3(s) d) CO₂(aq) + CO₂(g) d) Isochoric process CaO(s) + CO₂(g) A reaction is at equilibrium at a given temperature and constant pressure when a) AGsys > 0 b) AGsys <0 c) AGsys=0 d) AH = -x - 2y process, which of the following always increases b) the enthalpy of the system d) the entropy of the universe d) AHsys >0 The enthalpy and entropy of vaporization of ethanol are 38.6 kJ/mol and 109.8 J/mol K, respectively. Wha is the boiling point of ethanol, in °C? No 1 batz a) 352 °CRETO.0 b) 78.5 °C 1 c) 2.84 °C d) 624 °C
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