Material Science: Monovacancy Concentration

[flyfisher117]

Homework Statement

The Monovacancy formation energy of a metal is 80 kJ/mol. Hence the monovacancy concentration (CV) at 25 degrees celsius is about:

A)1.3x10^-13
B)9.5x10^-15
C).9
D)5x10^15

The Attempt at a Solution

I know the answer is B but I don't know how to get to that. I have no book for this course (professor told us not to worry about getting it because everything we need will either be given in lecture or found on the internet).

I don't have any notes on this and google is not returning anything helpful.

I was wondering if someone would be willing to walk me through how to solve this problem.

 

[mfb]

What is the formation energy per vacancy? What is the average energy per degree of freedom? You just need the Boltzmann factor.