Organic Chemistry Practice Problems Gibbs Free Energy Practice Problems Solution: The reaction of chloroethane with water in the gas...

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Solution: The reaction of chloroethane with water in the gas phase to produce ethanol and hydrogen chloride has ΔH° = +26.6 kJ mol -1 and ΔS° = +4.81 J K-1 mol-1 at 25°C. (b) Calculate ΔG° for the reaction. What can you now say about whether the reaction will proceed to completion?  

Problem

The reaction of chloroethane with water in the gas phase to produce ethanol and hydrogen chloride has ΔH° = +26.6 kJ mol -1 and ΔS° = +4.81 J K-1 mol-1 at 25°C. (b) Calculate ΔG° for the reaction. What can you now say about whether the reaction will proceed to completion?
 

 

Solution

We’re being asked to calculate the free energy change (ΔG˚) for the reaction of chloroethane with water at 25 ˚C.


We can calculate for ΔG˚ using the following equation:


ΔG°=ΔH°-TΔS°



We’re given:

ΔH˚ = 26.6 kJ mol–1

ΔS˚ = 4.81 J K–1 mol–1

T = 25 ˚C + 273 = 298 K


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