ΔG for reaction is 91.2 kJ.
WHAT IS GIBB'S FREE - ENERGY ?
Gibbs free energy, also known as the Gibbs function, Gibbs energy, or free enthalpy, is a quantity that is used to measure the maximum amount of work done in a thermodynamic system when the temperature and pressure are kept constant. Gibbs free energy is denoted by the symbol ‘G’. Its value is usually expressed in Joules or Kilojoules. Gibbs free energy can be defined as the maximum amount of work that can be extracted from a closed system.
ΔG° (NH₄Cl(s)) = -202.9 kJ/mol .
ΔG° (NH₃(g)) = - 16.4 kJ/mol .
ΔG° (HCl(g)) = - 95.3 kJ/mol .
[tex]\Delta G^o_{rxn} = \sum \Delta G^o_{(products)} - \sum \Delta G^o_{(reactantas)}[/tex]
[tex]= [\Delta G^o(NH_3(g)) + \Delta G^o(HCl(g))] - [\Delta G^o(NH_4 Cl(l))][/tex]
[tex]= [1mol * -16.4kJ/mol + 1mol * -95.3kJ/mol] - [1mol * - 202.9 kJ/mol][/tex]
[tex]= [(-16.4kJ) + (-95.3kJ)] - [-202.9kJ][/tex]
[tex]= - 111.7kJ + 202.9kJ[/tex]
[tex]= 91.2 kJ[/tex]
Thus, ΔG for reaction is 91.2 kJ.
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