For the reaction NH4Cl (s) NH3 (g) + HCL (g) at - Chemistry - Thermodynamics

Question

For the reaction NH4Cl (s) NH3 (g) + HCL (g) at 25 ,
enthalpy change DH = +177 kJ per mole and entropy change triangle
DS = +285 JK-1mol-1 Calculate free energy
change D G at 25°C and
predict whether the reaction is spontaneous or not

Rati Singh · Accepted Answer

Dear student

NH4Cl = NH3 + HCl

dG = dH - TdS
For spontaneous reaction dG should be negative

dG = 177 X 103 J/mol - 298K X 285 J/K-mol
dG = 92070 J/mol
OR 92 07 kj/mol

â€‹dG is positive so reaction is non
spontaneous

Regards
â€‹

For the reaction NH4Cl (s) NH3 (g) + HCL (g) at 25 , enthalpy change DH = +177 kJ per mole and entropy change triangle DS = +285 JK-1mol-1.Calculate free energy change D G at 25°C and predict whether the reaction is spontaneous or not.

For the reaction NH4Cl (s) NH3 (g) + HCL (g) at 25 , enthalpy change DH = +177 kJ per mole and entropy change triangle DS = +285 JK^-1mol^-1.Calculate free energy change D G at 25°C and predict whether the reaction is spontaneous or not.