At 298.15K, Gf(HCOOH,g) = -351.0kJ mol-1andGf(HCOOH,l) = -361.4kJ mol-1.Use R = 8.3145 J mol-1K-1. a) Calculate

At 298.15K, ΔG°f(HCOOH,g) = -351.0kJ mol-1 and ΔG°f(HCOOH,l) = -361.4kJ mol-1. Use R = 8.3145 J mol-1 K-1.

 

a) Calculate the vapor pressure of formic acid at 298.15 K.

 

Hint: treat the vaporization process as a reaction, with gas phase as the product, and use the relation between ln(Kp) and ΔG to find the vapor pressure.

 

Pvap,298.15 K = ____________ bar.

 

Given that ΔH°f(HCOOH,g) = -378.7kJ mol-1 and ΔH°f(HCOOH,l) = -425.0kJ mol-1. 

 

b) Calculate the vapor pressure of formic acid at 307.26 K.

 

Hint: Use the Clausius-Clapeyron Equation.

 

Pvap,307.26 K = ____________ bar.