If Kc=0.485 at 40.°C and Kc=0.620 at 90.°C, what is ΔH° for the reaction?

Q: Which one has a higher entropy? Explain briefly. MgC2(aq), NaCl(aq)

A: Entropy is a measure of the randomness of the system. The entropy of a system can be calculated by…

Q: For a particular chemical reaction DH = 6.8 kJ and DS = –29 J/K. Under what temperature condition is…

A: Gibbs Helmholtz Equation: Is the equation denoted by,…

Q: Ammonia reacts with water in liquid ammonia solution according to the equation: NH3(g) + H2O ⇌ NH4+…

A: Spontaneity of a chemical reaction can be expressed in terms of Gibbs free energy change. Write the…

Q: Predict whether the entropy change of the system in N2 (g, 10 atm) —> N2 (g, 1atm) is positive or…

A: The entropy of a substance increases with its molecular weight and complexity and with temperature.…

Q: Calculate ΔG°rxn (in kJ) for a reaction where ΔH°= +63 kJ, ΔS°= +675 J/K, and T = 298 K

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Q: Which substance would have the greatest standard molar entropy? O N2(g) NO2(g) O N2(1) O NO2(1)

A: Entropy (S): entropy dependence on randomness of a system . For example randomness order…

Q: At what temperatures will a reaction be spontaneous if ΔrH° = +62.4 kJ and ΔrS° = +301 J/K?

A: The given values are: ∆rH°=+62.4 kJ=62400 J ∆rS° =+301 J K-1 For a reaction, the relation between…

Q: Which of the following are spontaneous processes? 1. Ice melting at 1atm and 298 K (assume only ice…

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Q: Does someone know the standard entropy values in J/K for H2(g), F2(g) and HF(g)?

A: The standard entropy values of hydrogen and fluorine gases are 130.6 J/Kmol and 202.8 J/Kmol…

Q: What is the entropy change (in J/K) of 85 g of steam at 100°C when it condenses to water at the same…

A: At phase transition, the entropy change is defined as the ratio of enthalpy change and temperature…

Q: A certain reaction is spontaneous at 25°C. If the enthalpy change for the reaction is 29.8 kJ/mol,…

A:

Q: The element oxygen was prepared by Joseph Priestley in 1774 by heating mercury(II) oxide:…

A: Entropy: Entropy determines spontaneity of process. Spontaneity means perform a process in a given…

Q: 3. Consider the dissolution of NH,NO, in a chemical cold pack a. Is the process spontaneous? b. Is…

A: Those reaction in which energy is absorbed are known as the endothermic reactions while the…

Q: What is the change in entropy when 0.125 mol of potassium freezes at 67.2°C (Hfus = 2.39 kJ/mol)?

A: Freezing point, standard enthalpy of fusion and standard entropy can be related by the equation…

Q: The following reaction for the formation of glucose from carbon dioxide and water:…

A: The given reaction is,

Q: Predict whether the entropy change of the system in 2 H2 (g) + O2 (g) —> 2 H2O (l) is positive or…

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Q: If a chemical reaction is exothermic, but not spontaneous, which of the following must be true? AG v…

A: Here, we have to assign the sign of all thermodynamic properties.

Q: Suppose that a house and its exterior are both initially at 31 °C. Sometime after the air…

A: Spontaneous process is one which proceeds on its own and does not require any external assistance.…

Q: If the Delta*H = 135kJ / m * ol and AS 92 J/K mol, at what temperature does this reaction become…

A:

Q: From your knowledge of microstates and the structure of liquid water, explain the difference in…

A: Finding: Microstates To find Structure of liquid water

Q: For a certain chemical reaction, ∆H° = -35.4 kJ and ∆S° = -85.5 J>K.Is the reaction spontaneous…

A: For a reaction is given by, ∆G=∆H - T∆S where ∆H is the heat of enthalpy, T is the temperature and…

Q: Atte Calculate the standard change in Gibbs free energy for the reaction at 25 °C. Standard Gibbs…

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Q: For the reaction below ∆G° = + 33.0 kJ, ∆H° = + 92.2 kJ, and ∆S° = + 198.7 J/K. Estimate the…

A: We wil use the Gibbs helmholtz equation to calculate the temperature when ∆G is zero. And above this…

Q: If the AH = 200 kJ/mol and AS = 133 J/K mol, at what temperature does this reaction become…

A: Given: ∆H for the reaction = 200 kJ/mol ∆S for the reaction = 133 J/K mol We have to calculate the…

Q: The element oxygen was prepared by Joseph Priestley in 1774 by heating mercury(II) oxide: HgO(s) →…

A: Given chemical equation:  HgO(s) ------> Hg(l) + 1/2O2(g) For a reaction to be spontaneous,…

Q: What is the energy of system A? 15 What is the energy of system B? 16 9J 8J 6J In how many ways can…

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Q: At what temperatures is the following process spontaneous at 1 atm? ΔH° = +20 kJ og/and ΔS° = - 50…

A: The spontaneous nature of the reaction is determined by calculating the change of free energy of the…

Q: Calculate ΔH for the process:                                            N2(g) + 2O2(g) ⟶…

A: According to the Hess's law, the enthalpy change of final reaction can be calculated by sum of the…

Q: If a reaction is exothermic it is spontaneous. True or false

A: In this question, we will discuss About a Reaction is exothermic then it is spontaneous or not means…

Q: What is the standard change in free energy (in kJ) at 127°C for the reaction below, given ∆H° = -312…

A: given data are- ∆H° = -312 kJ  ∆S° = +66.7 J/K temperature = T = 127oC = 127 + 273 = 400 K free…

Q: represents the change in entropy for a system going from 142 possible microstates to 830 possible…

A: In Boltzmann's definition the entropy is the total numbers of possible microstates. the Boltzmann's…

Q: Consider the following chemical reaction for the formation of nitrogen dioxide:2 NO(g) + O₂(g) → 2…

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Q: Consider the following thermodynamic data which refer to 298 K. Substance SO2(g) Cl2(3) SO2CI2(g)

A: Hess's Law: The enthalpy and entropy changes of a reaction is calculated by using Hess's law, it is…

Q: 1. Calculate the standard enthalpy change when gaseous dinitrogen tetroxide (N2O4) reacts with…

A: ∆fH°(N2O4) = 9.66 KJ/mol ∆fH°(H2O) = -241.82 KJ/ mol ∆fH° ( H2) = 0 ∆fH° ( N2) = 0

Q: Suppose that a reaction has AH = -28 kJ and AS= -60 J/K. At what temperature will it change from…

A: We have to predict the temperature.

Q: Calculate ∆G° for a reaction for which ∆H° = 24.6 kJ and ∆S° = 132 J/K at 298 K. Is the reaction…

A:

Q: Which has lower entropy? CO2(g) or CH4(g)?

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Q: 11) Why can endothermic reactions be spontaneous?

A: Introduction: Endothermic reaction: The reaction which requires heat to form the product is called…

Q: 2. 22.5 g of Zn (Cp = 0.387 J/g°C) is heated to the boiling point of water, then added to 25 mL of…

A: Mass of zinc (m) = 22.5 g Specific heat capacity of zinc (s) = 0.387 J/goC Initial temperature of…

Q: Given the data below, calculate the temperature at which the reaction becomes spontaneous: N2 (g) +…

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Q: At what temperatures will the following processes be spontaneous?    ΔH= -18 kJ and ΔS= 65 J/K

A: Given: the value of enthalpy change (∆H) = -18 KJ The value of entropy change (∆S) = 65 J/K For a…

Q: Which of the following substances is likely to have the highest entropy? Link to Physical Constants…

A: The substances given are He, H2, CO2, N2 and H2O (l).

Q: Calculate the enthalpy change for the reaction 2K+ S K28 using the following thermochemical…

A: Given  1)K + S  ->  KS     Delta H = 32.5 KJ 2) KS + K ->  K2S     Delta H = 38.2 KJ    To…

Q: Without doing any calculations or using Sf data, arrange each group in order of increasing entropy.…

A: Always a gaseous (vapor) substance of same material have highest entropy compare to its liquid and…

Q: Given the values of ΔH and ΔS, which of the following changes will be spontaneous at constant T and…

A: Given :  ΔH = 125 kJ ΔS = 15.0 J/K T = 300. K

Q: Which Substance would have the greatest standard molar entropy?   N2(I) NO2(I) NO2(g) N2(g)

A: To find: The substance having the greatest standard molar entropy N2 (I) NO2 (I) NO2 (g) N2 (g)

Q: For a given reaction, ΔH∘∘= +35.5 kJ/mol and ΔS∘∘= +83.6 J/(K∙∙ mol). In what temperature range is…

A: From thermodyanamic relations, we have ΔGo = ΔHo - TΔSo      ------(1) For a reaction to be…

Q: For the reaction CO (g) + H,0 «) →C 208) ΔΗ. a) + H. 2(8) · calculate the following reaction's…

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Q: At what temperatures will a reaction be spontaneous if AH = +158 kJ and AS = +411 %3D %3D J/K? O The…

A: Given ΔH = 158 kJ = 158000 J ΔS =  411 J/K

Q: For which one of the following substances is AG,, the Gibbs free energy of formation, equal to zero?…

A: Option d should be the right answer.