Homework Answers
For a spontaneous reaction ΔG must be negative. At threshold ΔG = 0
We know ΔG = ΔH - TΔS
For ΔG = 0
T = ΔH / ΔS
Given ΔH = 51 kJ mol-1 , ΔS = 118.74 J K-1 mol-1
Therefore T = 51 x 10 3 / 118.74 = 429.5 K
.
Add Answer to:
9. A drug used to treat hypertension undergoes a decomposition reaction to give an insol- uble...
The enthalpy of a certain reaction is +233 kj/mol and the entropy is +110J/molk. Above what...
The
enthalpy of a certain reaction is +233 kj/mol and the entropy is
+110J/molk. Above what temperature will the reaction be
spontaneous.
The enthalpy of a certain reaction is +233 kJ/mol, and the entropy is +110 J/mol K. Above what temperature will the reaction be spontaneous? 8.
Consider the reaction CO(g) + 3H2(9)—CH (9) +H20(9) for which AH° = -206.1 kJ and A...
Consider the reaction CO(g) + 3H2(9)—CH (9) +H20(9) for which AH° = -206.1 kJ and A Sº = -214.7 J/K at 298.15 K. (1) Calculate the entropy change of the UNIVERSE when 1.982 moles of CO(g) react under standard conditions at 298.15 K. A Suniverse JK (2) Is this reaction reactant or product favored under standard conditions? (3) If the reaction is product favored, is it enthalpy favored, entropy favored, or favored by both enthalpy and entropy? If the reaction...
A critical reaction in the production of energy to do work or drive chemical reactions in...
A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate, ATP, to adenosine diphosphate, ADP, as described by the reaction ATP(aq) + H,O(1) ADP(aq) + HPO- (aq) for which AG = -30.5 kJ/mol at 37.0 °C and pH 7.0. Calculate the value of AG xn in a biological cell in which [ATP] = 5.0 mm, (ADP) = 0.10 mM, and (HPO 1 - 5.0 mM. AG...
A reaction has an enthalpy change of - 71 kJ mol" and an entropy change of...
A reaction has an enthalpy change of - 71 kJ mol" and an entropy change of -58 JK-mol-. At what temperature does this exothermic reaction cease to be spontaneous? 422°C 673°c 826°C O 951°C What is the molar reaction enthalpy for the reaction below: N2H4(0) +CHNO(0) 4CHẠO(g) +Ng(g) + 3H (g) given the following thermodynamic data? 2NH3(9) ► N2H4(l) + H2(9) A,Hm = 22.5 kJ mol-1 2NH3(9) N2(g) + 3H2(9) A Hm = 57.5 kJ mol-1 CH,0(9) + H2(g) +...
QUESTION 23 - For the reaction below at 298 K: 4NO (9) N20 (9) + N203...
QUESTION 23 - For the reaction below at 298 K: 4NO (9) N20 (9) + N203 (9) AH = -192.7 kJ and AS = -308.2 J/K Which of the following statements is TRUE? AG >0 at 298K At higher temperatures, the reaction will be spontaneous At lower temperatures, the reaction will be spontAreous The reaction is spontaneous at all temperatures. None of the above are true. QUESTION 24 What is Asº at 298 K for the following reaction? 2 H2S(g)...
9. The enthalpy of decomposition of gaseous water to oxygen and hydrogen at 298 K and 1 atm is 241.75 kJ/mol. Cal...
9. The enthalpy of decomposition of gaseous water to oxygen and hydrogen at 298 K and 1 atm is 241.75 kJ/mol. Calculate its value at 348 K. The molar heat capacity values (in J/K.mol) are: Cm (H20) 33.56, C.m (O2) 29.12, Cm (H2) 28.82.
The vaporization of compound A is described by the following chemical equation. A(1) A(8) A rap(72.39...
The vaporization of compound A is described by the following chemical equation. A(1) A(8) A rap(72.39 °C) = 38.21 kJ/mol Calculate the entropy of vaporization, Aswap, for A(l) at 25.0 °C given that the boiling point of A is 72.39 °C, and the molar heat capacity of A(l) is 119.09 J/mol K). Assume that the molar heat capacity of A(R) is 56.5% of that of A(1). ASP J. mol-K Calculate the standard enthalpy of vaporization. A Hap, for A(1) at...
Gaseous ozone undergoes decomposition according to the stochiometric equation: 203(g) →302 (g) Two alternative mechanisms have...
Gaseous ozone undergoes decomposition according to the stochiometric equation: 203(g) →302 (g) Two alternative mechanisms have been proposed to account for this reaction. Mechanism 2 03 302 bimolecular, rate constant k Mechanism II 03 02 + fast equilibrium, equilibrium constant K1 0+ 03 — 202 slow, rate constant k2 A. Derive rate laws for the formation of O2 for each mechanism. B. Thermodynamic measurements give standard enthalpies of formation for each of the following species at 298 K: species AH°...
From AHⓇ and AS 11. Hydrogen reacts with nitrogen to form ammonia (NH) according to the...
From AHⓇ and AS 11. Hydrogen reacts with nitrogen to form ammonia (NH) according to the reaction 3H:(g) +Nz() 5 2NH,(g) The value of Alºis -92.38 kJ/mol, and that of AS is -198.2 J/mol K. Determine AG at 25°C. a. +5.897 x 109 kJ/mol d. -16,66 kJ/mol b. +297.8 kJ/mol +49.5 kJ/mol c.-33.32 kJ/mol Free Energy, Entropy, Enthalpy 12. A reaction with a low enthalpy of reaction value is not spontaneous at low temperature but becomes spontaneous at high temperature....
5. Above what temperature does the following reaction become nonspontaneous AS = -153.2 J/K Given: AH...
5. Above what temperature does the following reaction become nonspontaneous AS = -153.2 J/K Given: AH = -1036 k); 2 H2(g) + 3 O2(g) → 2 502(g) + 2 H20(g) AG - AH' - TAS 46 = -1036000 -(T)(-153.2) = 0 6. What is the minimum temperature required for the spontaneous conversion of Cla(I) to CCL() Given: AH"vap) is 57.3 kJ/mol and ASva) is 164 J/(mol)? AG AH - TAS = 298 K 06 = 57300 - (298)(164) 46°= 8428...
The
enthalpy of a certain reaction is +233 kj/mol and the entropy is
+110J/molk. Above what temperature will the reaction be
spontaneous.
The enthalpy of a certain reaction is +233 kJ/mol, and the entropy is +110 J/mol K. Above what temperature will the reaction be spontaneous? 8.
Consider the reaction CO(g) + 3H2(9)—CH (9) +H20(9) for which AH° = -206.1 kJ and A Sº = -214.7 J/K at 298.15 K. (1) Calculate the entropy change of the UNIVERSE when 1.982 moles of CO(g) react under standard conditions at 298.15 K. A Suniverse JK (2) Is this reaction reactant or product favored under standard conditions? (3) If the reaction is product favored, is it enthalpy favored, entropy favored, or favored by both enthalpy and entropy? If the reaction...
A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate, ATP, to adenosine diphosphate, ADP, as described by the reaction ATP(aq) + H,O(1) ADP(aq) + HPO- (aq) for which AG = -30.5 kJ/mol at 37.0 °C and pH 7.0. Calculate the value of AG xn in a biological cell in which [ATP] = 5.0 mm, (ADP) = 0.10 mM, and (HPO 1 - 5.0 mM. AG...
A reaction has an enthalpy change of - 71 kJ mol" and an entropy change of -58 JK-mol-. At what temperature does this exothermic reaction cease to be spontaneous? 422°C 673°c 826°C O 951°C What is the molar reaction enthalpy for the reaction below: N2H4(0) +CHNO(0) 4CHẠO(g) +Ng(g) + 3H (g) given the following thermodynamic data? 2NH3(9) ► N2H4(l) + H2(9) A,Hm = 22.5 kJ mol-1 2NH3(9) N2(g) + 3H2(9) A Hm = 57.5 kJ mol-1 CH,0(9) + H2(g) +...
QUESTION 23 - For the reaction below at 298 K: 4NO (9) N20 (9) + N203 (9) AH = -192.7 kJ and AS = -308.2 J/K Which of the following statements is TRUE? AG >0 at 298K At higher temperatures, the reaction will be spontaneous At lower temperatures, the reaction will be spontAreous The reaction is spontaneous at all temperatures. None of the above are true. QUESTION 24 What is Asº at 298 K for the following reaction? 2 H2S(g)...
9. The enthalpy of decomposition of gaseous water to oxygen and hydrogen at 298 K and 1 atm is 241.75 kJ/mol. Calculate its value at 348 K. The molar heat capacity values (in J/K.mol) are: Cm (H20) 33.56, C.m (O2) 29.12, Cm (H2) 28.82.
The vaporization of compound A is described by the following chemical equation. A(1) A(8) A rap(72.39 °C) = 38.21 kJ/mol Calculate the entropy of vaporization, Aswap, for A(l) at 25.0 °C given that the boiling point of A is 72.39 °C, and the molar heat capacity of A(l) is 119.09 J/mol K). Assume that the molar heat capacity of A(R) is 56.5% of that of A(1). ASP J. mol-K Calculate the standard enthalpy of vaporization. A Hap, for A(1) at...
Gaseous ozone undergoes decomposition according to the stochiometric equation: 203(g) →302 (g) Two alternative mechanisms have been proposed to account for this reaction. Mechanism 2 03 302 bimolecular, rate constant k Mechanism II 03 02 + fast equilibrium, equilibrium constant K1 0+ 03 — 202 slow, rate constant k2 A. Derive rate laws for the formation of O2 for each mechanism. B. Thermodynamic measurements give standard enthalpies of formation for each of the following species at 298 K: species AH°...
From AHⓇ and AS 11. Hydrogen reacts with nitrogen to form ammonia (NH) according to the reaction 3H:(g) +Nz() 5 2NH,(g) The value of Alºis -92.38 kJ/mol, and that of AS is -198.2 J/mol K. Determine AG at 25°C. a. +5.897 x 109 kJ/mol d. -16,66 kJ/mol b. +297.8 kJ/mol +49.5 kJ/mol c.-33.32 kJ/mol Free Energy, Entropy, Enthalpy 12. A reaction with a low enthalpy of reaction value is not spontaneous at low temperature but becomes spontaneous at high temperature....
5. Above what temperature does the following reaction become nonspontaneous AS = -153.2 J/K Given: AH = -1036 k); 2 H2(g) + 3 O2(g) → 2 502(g) + 2 H20(g) AG - AH' - TAS 46 = -1036000 -(T)(-153.2) = 0 6. What is the minimum temperature required for the spontaneous conversion of Cla(I) to CCL() Given: AH"vap) is 57.3 kJ/mol and ASva) is 164 J/(mol)? AG AH - TAS = 298 K 06 = 57300 - (298)(164) 46°= 8428...
Most questions answered within 3 hours.
-
What is meant by a “term premium”?
What can explain such a premium? Is it a...
asked 3 minutes ago -
23. Which molecule has only covalent bonds? A. CO2 B. Al2O3 C.
Mg3N2
24. The octet...
asked 29 minutes ago -
the
total pressure for a mixture of N2O4 and NO2 is 2.20 atm. If Kp=
7.10...
asked 31 minutes ago -
Delaware Corp. prepared a master budget that included $22,385
for direct materials, $28,600 for direct labor,...
asked 28 minutes ago -
For pesticide HCB (hexachlorobenzene), its logarithmic partition
coefficient log Kow is 5.6. What would be the...
asked 31 minutes ago -
A chemist requires 0.422 mil Na2CO3 for a reaction. How many
grams does this correspond to?
asked 35 minutes ago -
If the vapor pressure of carvone is approximately 9.4 torr at 99
°C, approximately how much...
asked 54 minutes ago -
A juice bottling company is carrying out a test at 10%
significance that the mean population...
asked 1 hour ago -
What is the reflectivity (in percent) needed to keep water at a
temperature near its freezing...
asked 1 hour ago -
Suppose that the average surface temperature of Earth is 300K.
Assume this is uniform over its...
asked 1 hour ago -
Draw the condensed structural formula for alkenes and alkynes or
the line-angle structural formula for cycloalkenes...
asked 1 hour ago -
M. Laing has suggested a new arrangement of the periodic table
(J.Chem.Ed.1989, 66,
746). Answer the following...
asked 1 hour ago