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According to 2nd law of thermodynamics, in a spontaneous process, which of the following always increases a) the entropy of the system c) the energy of the universe b) the enthalpy of the system d) the entropy of the universe mature and constant pressure when

According to 2nd law of thermodynamics, in a spontaneous process, which of the following always increases a) the entropy of the system c) the energy of the universe b) the enthalpy of the system d) the entropy of the universe mature and constant pressure when

Chemistry: Matter and Change
Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter15: Energy And Chemical Change
Section: Chapter Questions
Problem 112A: sample of natural gas is analyzed and found to be88.4% methane (CH4) and 11.6% ethane (C2H6) bymass....
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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
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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