Calculate K p for the evaporation of water at 25 C, given that D G = +8.6 kJ/mol for the process:
H₂ O ( ) H₂ O (g)

Question

Calculate K p for the evaporation of water at 25 C, given that D G = +8.6 kJ/mol for the process:
H₂ O (  )  H₂ O (g)

Quizplus · Accepted Answer

The relationship between K p and ΔG° is given by:

ΔG° = -RTlnKp

where R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (298 K for 25°C), and ln is the natural logarithm.

First, we need to convert ΔG from kJ/mol to J/mol:

ΔG = 8.6 kJ/mol = 8600 J/mol

Then, we can calculate Kp:

8600 J/mol = - (8.314 J/mol·K) × (298 K) × lnKp

lnKp = -3.2917

Kp = e^(-3.2917) = 4.4 × 10^(-2)

Therefore, the best choice is E) 3.1×10−2.

Calculate K P for the Evaporation of Water at 25