Consider a galvanic cell built on the following half-reactions with their standard reduction potentials shown. What is ∆G° at 25 °C for the reaction involved?

1F = 96,485 J/mol e-

Cr2O72- + 14H+ + 6e- <=> 2Cr3+ + 7H2O E° = 1.20 V

H2O2 + 2H+ + 2e- <=> 2 H2O E ° = 1.75 V

Explanation:

Cr272- + 14H+ + 6e- <=> 2Cr3+ + 7H2O E° = 1.20 V

(H2O2 + 2H+ + 2e- <=> 2H2O E ° = 1.75)x3

EMF of the cell = 1.75 x 3 - 1.20

E = 4.05 V

∆G° = - n E F  

n = 6  

E = 4.05

F = 96485

∆G° = - 6 x 4.05 x 96485

= - 2344585.5 J

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.