The diffusion coefficients for species A in metal B are given at two temperatures: T (°C) D (m2/s) 1030 6.11 × 10-17 1250 6.02× 10-16 (a) Determine the value of the activation energy Qd (in J/mol). J/mol (b) Determine the value of D0. m2/s (Use scientific notation.) (c) What is the magnitude of D at 1160°C? m2/s (Use scientific notation.)

(a). The value of the activation energy is 171565.80 J/mol.

(b). The value of D₀ is

(c). The magnitude of D at 1160°C is

Explanation:

Given that,

Temperatures,

Diffusion coefficients are

(a). We need to calculate the value of the activation energy

Using relation between diffusion coefficient and temper

....(I)

.....(II)

Divided equation (II) by (I)

Put the value into the formula

(b). We need to calculate the value of D₀

Using relation between diffusion coefficient and temperature

Put the value of  in to the formula

Now again put the value in the equation (II)

Hence, (a). The value of the activation energy is 171565.80 J/mol.

(b). The value of D₀ is

(c). The magnitude of D at 1160°C is

the total distance traveled by the car is

30km + 49km = 79 km .