Consider the reaction
Given that ΔG° for the reaction at 25°C is 173.4 kJ/mol, (a) calculate the standard free energy of formation of NO and (b) calculate Kp of the reaction. (c) One of the starting substances in smog formation is NO. Assuming that the temperature in a running automobile engine is 1100°C, estimate Kp for the given reaction. (d) As farmers know, lightning helps to produce a better crop. Why?
Interpretation:
Calculate the standard free energy
Concept Introduction:
Standard free energy
Entropy
Homogeneous equilibrium: A homogeneous equilibrium involved has a everything present in the same phase and same conditions, for example reactions where everything is a gas, or everything is present in the same solution.
Kp and Kc: This equilibrium constants of gaseous mixtures, these difference between the two constants is that Kc is defined by molar concentrations, whereas Kp is defined by the partial pressures of the gasses inside a closed system.
Le Chatelier's Principle (Kp): In a closed system if there is an increase in pressure, then the equilibrium will shift towards the side of the reaction having smaller number of moles. The decrease in pressure the equilibrium will shift towards the side of the reaction with high moles of gas.
To find: Calculate the
Answer to Problem 15.95QP
The equilibrium constant (Kp), standard free energy values
Explanation of Solution
(a)
Calculate and analyze the standard free energy
Consider the following equation (1)
The equilibrium constant is related to the to the standard free energy change by the followed above equation (1). Than the given statement of values (KP, R and T) are substituted in same equation.
Let us consider the statement (b)
The given equilibrium concentration reaction the different reactants and products all exists in the single phase and this equilibrium reaction expression contains single conditions like gases phase, so this equilibrium reaction homogenies equilibrium reaction. The thermodynamic terms are constant can also be represented by Kp, Kc, R, T and
To find: Calculate the standard enthalpy changes (
(b)
Calculate the standard enthalpy changes
The given reaction is homogenous equilibrium reaction proceeds in same conditions (for example both reactant and product are proceeds in gas phase). Further the total equilibrium that is given N2 and two products are generated in
Statement (d): The equilibrium reactions lightening supply the energy necessary to derive this reaction, concerting the two most abundant gases in the atmosphere into
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