In: Chemistry
PART A.
Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is
C2H2(g)+2H2(g)⇌C2H6(g)
All pressures equal to 1 atm and the common reference temperature 298 K, What is Kp?
Substance | ΔG∘f (kJ/mol) |
C2H2(g) | 209.2 |
H2(g) | 0 |
C2H6(g) |
−32.89 |
PART B.
At 25 ∘C the reaction from Part A has a composition as shown in the table below.
Substance | Pressure (atm) |
C2H2(g) | 4.95 |
H2(g) | 5.65 |
C2H6(g) | 1.25×10−2 |
What is the free energy change, ΔG, in kilojoules for the reaction under these conditions?
Here asked free energy change
∆G = ∆G° + RTlnK
∆G° = -242.09 kJ / mol ( from part A)
∆G = -242.09 kJ / mol -23.4 kJ/mol
∆G = -265.49 kJ