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Multiple Choice
Calculate ΔG°rxn at 298 K for the following reaction: I2(g) + Cl2(g) ⇌ 2ICl(g), given that Kp = 81.9. Which of the following is the correct value of ΔG°rxn?
A
-81.9 kJ/mol
B
-11.4 kJ/mol
C
11.4 kJ/mol
D
0 kJ/mol
Verified step by step guidance
1
Identify the relationship between the standard Gibbs free energy change (ΔG°rxn) and the equilibrium constant (Kp) using the equation: ΔG°rxn = -RT ln(Kp).
Determine the values needed for the calculation: R (the universal gas constant) is 8.314 J/(mol·K), and T (temperature) is given as 298 K.
Substitute the known values into the equation: ΔG°rxn = -(8.314 J/(mol·K) * 298 K) * ln(81.9).
Convert the result from joules to kilojoules by dividing by 1000, since the options for ΔG°rxn are given in kJ/mol.
Compare the calculated value of ΔG°rxn with the provided options to determine the correct answer.