A titanium cube contains 2.86*10^23 atoms. What is the edge length of the cube? The density of titanium is 4.50 g/cm^3. (The volume of a cube is V=l^3.)

Express the length in centimeters to three significant figures.

Answer: 1.72cm

Explanation:

First let us calculate the mass of titanium that contain 2.86*10^23 atoms ...

1mole of a substance contains 6.02x10^23 atoms as we have come to understand from Avogadro's hypothesis. Therefore, 1mole of titanium also contains 6.02x10^23 atoms.

1mole of titanium = 48g

1mole (i. e 48g) of titanium contains 6.02x10^23 atoms,

Therefore Xg of titanium will contain 2.86*10^23 atoms i. e

Xg of titanium = (48x2.86*10^23) / 6.02x10^23 = 22.8g

Next, we must find the volume of titanium

Density of titanium = 4.5g/cm^3

Mass of titanium = 22.8g

Volume = ?

Density = Mass / volume

Volume = Mass / Density

Volume = 22.8/4.5

Volume = 5.07cm^3

Now we can find the edge length:

Volume = 5.07cm^3

Length = ?

V = L^3

L = cube root (V)

L = cube root (5.07)

L = 1.72cm