Question

Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction free energy of the following chemical reaction: ?+S8s24F2g8SF6g Round your answer to zero decimal places.

Answer 1

Sol:-

Note :- (1).Standard Free energy of formation of S₈ (g) ( i.e deltaG⁰_f of S₈ (s)  ) = 0 KJ/mol

(2). Standard Free energy of formation of F₂ (g) ( i.e deltaG⁰_f of F₂ (g)? ) = 0 KJ/mol and

(3). Standard Free energy of formation of SF₆ (g) ( i.e deltaG⁰_f of SF₆? (g) ) = - 1116.4 KJ/mol

Given equation is :-

S₈ (s) + 24 F₂ (g) ----------------> 8 SF₆ (g) , deltaG_rxn⁰ = ?

we know

deltaG_rxn⁰ = [Sum of Standard Free energy of formation of products ] - [ Sum of Standard Free energy of formation of reactants ]

deltaG_rxn⁰ = [ 8 x deltaG⁰_f of SF₆? (g) ] - [ 1 x deltaG⁰_f of S₈ (s) + 24 x deltaG⁰_f of F₂ (g) ]

deltaG_rxn⁰ = [ 8 x ( - 1116.4 KJ/mol ] - [ 1 x 0 KJ/mol + 24 x 0 KJ/mol ]

deltaG_rxn⁰ = - 8931.2 KJ/mol - 0 KJ/mol

deltaG_rxn⁰ = - 8931.2 KJ/mol

Hence Standard free energy of the reaction i.e deltaG_rxn⁰ = - 8931.2 KJ/mol