Free energy of reactions

Question

Use the table below to answer the following questions (a - d). After you determine the ΔG for the reaction, decide whether each reaction is spontaneous. Complete the table with the correct response. (Note: Add 273 to temperature values given in Celsius to convert them to Kelvin.)

a) What is the free energy change, in kJ/mol, of Reaction I? Is the reaction spontaneous? (Complete the table to answer.) (3 points)

b) What is the free energy change, in kJ/mol, of Reaction II? Is the reaction spontaneous? (Complete the table to answer.) (3 points)

c) What is the free energy change, in kJ/mol, of Reaction III? Is the reaction spontaneous? (Complete the table to answer.) (3 points)

d) What is the free energy change, in kJ/mol, of Reaction IV? Is the reaction spontaneous? (Complete the table to answer.) (3 points)

Answer 1

Use the eqution ΔG = ΔH - TΔS to calculate the Gibbs free energy. If ΔG is < 0, the reaction is spontaneous; if ΔG > 0, not-spontaneous.

Reaction I No +5.1 x 10² kJ/mole

Reaction II Yes -1.7 x 10⁴ kJ/mole

Reaction III No +6.77 x 10⁴ kJ/mole

Reaction IV yes -2.00 x 10⁵ kJ/mole