Problem: Consider the following reaction:3CH4(g)  →  C3H8(g) + 2H2(g)Calculate ΔG at 298 K if the reaction mixture consists of 41 atm of CH4, 0.013 atm of C3H8, and 0.021 atm of H2.

FREE Expert Solution

Recall that ΔG and K are related to each other:


ΔG°rxn=-RTlnK


Step 1. We are given the following equilibrium pressures of each compound:

PCH4 = 41.0 atm

PC3H8 = 0.013 atm

PH2 = 0.021 atm


And the Kp expression for this reaction is:

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Problem Details

Consider the following reaction:

3CH4(g)  →  C3H8(g) + 2H2(g)

Calculate ΔG at 298 K if the reaction mixture consists of 41 atm of CH4, 0.013 atm of C3H8, and 0.021 atm of H2.

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