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Gibbs Free Energy

#### Q. Chlorine gas, Cl2(g), reacts with nitric oxide, NO(g), to form nitrosyl chloride, NOCl(g), via the reaction Cl2(g) + 2NO(g) ⇌ 2NOCl(g) The thermodynamic data for the reactants and products in the reaction are given in the following table: The diagram below serves as a pictorial depiction of the relationship between the free energy and standard free energy in the equation ΔG = ΔG° + RT ln Q. Point A is at standard conditions, which means all reagents have a partial pressure of 1 atm, as shown in the equation below point A. Points B and C are at nonstandard conditions. Point X indicates the point at which equilibrium lies. The axis labeled Q refers to the reaction quotient. The actual value of Q at the point of equilibrium is Kp, which is the equilibrium constant at 298 K. Calculate the free energy ΔG at 25 °C for the nonstandard conditions at point C where the reaction quotient Q is 3.58 x 10^9. Express your answer numerically in kilojoules.

Solved • Mar 2, 2020

Gibbs Free Energy

#### Q. Based on the standard free energies of formation, which of the following reactions represent a feasible way to synthesize the product? Drag the appropriate items to their respective bins.

Solved • Mar 2, 2020

Spontaneous Reaction

#### Q. If ΔH = -60.0 kJ and ΔS = -0.500 kJ/K, the reaction is spontaneous below a certain temperature. Calculate that temperature. Express your answer numerically in kelvins.

Solved • Mar 2, 2020

Gibbs Free Energy

#### Q. Consider the reaction KClO4(s) → KCl(s) + 2O2(g) and the following tale values: State whether it would be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions and explain why.

Solved • Mar 2, 2020

Kinetic Energy of Gases

#### Q. A gas mixture contains HBr, NO2, and C2H6 at a fixed temperature and pressure. Which gas molecules have the highest average kinetic energy at this temperature?

Solved • Mar 28, 2020

Gibbs Free Energy

#### Q. Acetylene, C2H2, can be converted to ethane, C2h6, by a process known as hydrogenation. the reaction is C2H2(g) + 2H2(g) ⇌ C2H6(g) Given the following data at standard conditions (all pressures equal to 1 atm and the common reference temperature 298 K), what is the value of Kp for this reaction? Express your answer using two significant figures. At 25 °C the reaction from Part A has a composition as shown in the table below. What is the free energy change, ΔG, in kilojoules for the reaction under these conditions? Express your answer numerically in kilojoules.

Solved • Mar 2, 2020

Gibbs Free Energy

#### Q. For the decomposition of calcium carbonate, consider the following thermodynamic data ( Due to variations in thermodynamic values for different sources, be sure to use the given values in calculating your answer.): ΔH°rxn 178.5kJ/mol ΔS°rxn 161.0J/(mol.K) Calculate the temperature in kelvins above which this reaction is spontaneous. Express your answer to four significant figures and include the appropriate units. The thermodynamic values from part A will be useful as you work through part B: ΔH°rxn 178.5kJ/mol ΔS°rxn 161.0J/(mol.K) Calculate the equilibrium constant for the following reaction at room temperature, 25°C: CaCO3(s) → CaO(s) + CO2(g) Express your answer numerically to three significant figures.

Solved • Mar 2, 2020