# Problem: The lowest pressure attainable using the best available vacuum techniques is about 10-12N/m2.At such pressure, how many molecules are there per cm3 at 13 °C?Express your answer using two significant figures.

###### FREE Expert Solution

Consider the gas law:

$\overline{){\mathbf{P}}{\mathbf{V}}{\mathbf{=}}{\mathbf{n}}{\mathbf{R}}{\mathbf{T}}}$, where n is the number of moles and R is the gas constant given by, R = 8.314 J•K-1

The number of molecules is given by:

, where NA is Avogadro's number.

###### Problem Details

The lowest pressure attainable using the best available vacuum techniques is about 10-12N/m2.

At such pressure, how many molecules are there per cm3 at 13 °C?

Express your answer using two significant figures.