So basically 6.2 times ten to 23 molecules, this is Avogadro's number. So if you multiply top and bottom by Avogadjo's number, we won't change our result. And we get an A multiplied by m multiplied by one minus v bar, the density divided by an a multiplied by F. So this doesn't change because we can simply cross this out and we get back our result. Now, notice that Avogadro's number multiplied by the mass of that object gives us the molar mass of that object. Remember, the molar mass of some particle is basically the mass of Avogadro's number of particles. So if we take this particle and we collect Avogadro's number, we get a mass value that is equal to NA multiplied by m. So this is another way of basically describing that same equation.