# Calculation of Number Density

Number density equation is given by

$n= \dfrac{(N_A)\rho}{M}$

where $N_A =6.023\times10^{23} mol^{-1}$

$\rho=8.02\ g/cm^3$(at 1500 degree celsius.)

$M=63.546*1.6605\times10^{-24} g$

Whats wrong with this values? I am failed to calculate number density.

-

In your formula $M$ is the molar mass given in $g \,\text{mol}^{-1}$ so for your compound $M=63.546 \,g \,\text{mol}^{-1}$ and the density in atoms per cubic centimeter will be $n=7.6 \cdot 10^{22}$$\text{cm}^{-3}$.