Hydrogen is diffusing through solid nickel. at a temperature of 358 k, the diffusivity is 1.16 x 10-8 cm2/s. at a temperature of 438 k, the diffusivity is 1.05 x 10-7 cm2/s. what is the activation energy in j/mol?

Q_d=35881 J/mol

So the activation energy is 35881 J/mol.

Explanation:

Consider the following equations:

Solving the above two equation to find the Q_d in term of diffusivity and temperature we will get:

where:

Q_d is the activation energy

D_1 is the diffusivity at T_1

D_2 is the diffusivity at T_2

Q_d=35881 J/mol

So the activation energy is 35881 J/mol.