## Materials Science and Engineering: An Introduction

$\frac{N_{v}/N (1357 K)} {N_{v}/N (298 K)} = 7.5 \times 10^{11}$
We use a ratio to find: $\frac{N_{v}/N (1357 K)} {N_{v}/N (298 K)} = \frac{4.56 \times 10^{-4}}{6.08 \times 10^{-16}} = 7.5 \times 10^{11}$