Question

In: Chemistry

Calculate E

Expert Solution

(a) Mg(s) + Sn²⁺(aq) Mg²⁺(aq) + Sn(s)

E⁰_cell= E⁰_cathode- E⁰_anode

E⁰_cell= E⁰_Sn+2/Sn- E⁰_Mg+2/Mg

= -0.14 - (-2.37)

E⁰_cell = 2.23 V

now nernest equation

Ecell = E⁰_cell -RT/nF* log [Mg+2]/[Sn+2]

Ecell = 2.23 -0.0591/2* log [0.049]/[0.037]

Ecell =2.22 V

detla G⁰ = -nF E_cell⁰

⁼ - 2 x 96500 x 2.23

= -430.4kJ

(b) 3 Zn(s) + 2 Cr³⁺(aq) 3 Zn²⁺(aq) + 2 Cr(s)

E⁰_cell= E⁰_cathode- E⁰_anode

E⁰_cell= E⁰_Cr+3/Cr- E⁰_Zn+2/Zn

= -0.74 - (- 0.76)

E⁰_cell = 0.02

Ecell = 0.02 -0.0591/2* log [0.0084]³/[0.019]²

Ecell =0.102V

detla G⁰ = -nF E_cell⁰

= - 6 x 96500 x 0.02

= -11.58kJ

queen_honey_blossom answered 3 months ago

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