# Finding the value of Avogadro's number (Chemistry)...?

Avogadro's number, the number of particles in a mole, can be experimentally determined by first "counting" the number of atoms in a smaller space and then scaling up to find the number of particles that would have a mass equal to the atomic or molecular mass in grams. Here is some real data from which Avogadro's number can be determined.

X-Ray diffraction studies show that gold consists of a repeating atomic arrangement where the repeating unit (called a cell unit) is a cube containing 4 gold atoms. Each side of the cube has a length of 4.08x10^-8 cm. The density of gold is 19.3 g / cm^3 and its atomic mass is 197.

Calculate the value of Avogadro's number from these data.

### 1 Answer

- 1 decade agoFavorite Answer
This is fun

find the volume so cube 4.08x10^-8 cm

197g x (1 cm3/19.3g)(4atoms/6.4 x 10-23cm3)= x atoms

you need to actually do the calculation for vol. I just estimated

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